Cb750 sohc valve adjustment. efyou Guest; CB750 Clutch Adjustment .

Cb750 sohc valve adjustment 004 2 . CB750 Enthusiast. I've adjusted the floats several times, but I keep getting the same problem. Valve Spring Specifications:• Installed Height: 37,0mm (same as stock)• Seat Pressure: 79lbs / 35,9 Kgf• Open Pressure (10mm): Aug 23, 2013 · That cap design is similar to Honda valve checking plugs on SOHC and smaller like 350s. loxley007 CB750 Addict. Here lies the issue. Well, today I got to work and have it starting on first try every time and idling continuously. 00 and $5. ) as follows: INSTALLED HT. nateweisiger02; Apr 12, 2023; The SOHC Garage (1969-1978) Replies 4 Views 1K. net (now Oct 9, 2024 · CB750K - 1975 I am having difficulty getting a . Author Topic: CB750 Cylinder/Exhaust Temps (Read 2818 times) 0 Members and 1 Guest are viewing this topic. Set it to the mark, verify that both intake and exhaust rocker arms on cylinder 1 are loose, then advance it forward 15 degrees. = Solid Height + . I just bought a CB750 for 450 bucks yesterday. how to use the tune/use adjuster screw on a Keihin carb 064A ANA Carb with pods make sure they are closing and not hanging up from a throttle cable adjustment issue or a linkage bind. and the no. I was always changing them on the smaller twins for that. The problem is that my carbs don't have this screw installed and I believe these to be stock original carbs. noob move. Feb 24, 2025 · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: More Insanity!, did a valve adjust but now have ticking. , the no. With the spring in it is 0. Messages 11 Reaction score 2 CB750 Addict. I just placed new ones on yesterday cause I saw some pitting. valve adjustment. This will be your high point on the advancer cam there. Honda CB750 Engine Parts – SDG Moto Custom & Cafe Honda CB750/500 Engine Parts. Stock jets and airbox witha Delkivic 4 into 1. Apr 19, 2013 · - Adjust both intake and exhaust valve clearance to the values given in the manual using a feeler gauge to measure. The float valve needle looks fine, but the brass valve itself seems to have some very fine marks around the bottom hole. 4 are loose, then obviously adjust no. Welcome, Guest Oversize intake valves with Mike Reick stage 3 porting and titanium retainers (new springs as well) RC295 Cam (as the Ford 427 SOHC engines showed) this advancing rate should be linear (as springs are) and might not have an upper limit of total Jan 26, 2025 · you cant remove the valve cover while the engine is still in the frame. Messages 191 Reaction score 74 Points 28 Location Phoenix AZ. Setting the lash to exactly 1mm took quite some time. But here comes a vague situation. Noz chain feed - o Nov 7, 2014 · The proper gap is . dirtdigger Moderator. (Some people would say "the intake valve was smaller Sep 9, 2023 · CB750 - Will not run without full advance - WHY? SOHC/4 Owners Club Forums. 5mm from the arm. My accelerator pump was working great 2 weeks ago. Messages 17 Reaction score 0 Points 1 Location cheyenne, wy. 6 days ago · SOHC/4 Owners Club Forums Author Topic: Adjustment for the cb750 cam chain (Read 7044 times) 0 Members and 1 Guest are viewing this topic. intake 1 . Messages 4 Reaction score 0 Points 1 Location Halifax, Nova Scotia. efyou Guest; CB750 Clutch Adjustment 1 day ago · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic I'm new to the scene. May 9, 2012 · Here's a good video for checking valve clearances on the DOHC CB750s. Jarrett_Honda CB750 Member. Jun 6, 2021 · I am in the process of restoring a 78 CB750 Super Sport, the last SOHC model of the 750 fours. Just an idea May 3, 2013 · SOHC/4 Owners Club Forums » Tech Forums » My setup is a late 72 cb750 engine with stock advancer, japanese daichi points, The mark past t and f, that corner mark where you would leave it for a cam chain adjustment as well. I'll test with lash in the range of 0. nateweisiger02; Apr 12, 2023; Replies 4 Views 1K. and tightened it down. Haven’t ridden it much at all, barely had any torque after that, now the bike will barely pull its own weight. to adjust. '75 CB750 Chop '72 CB750 Cafe. 00 including shipping). They say smash the spring to "solid" in a vice (be careful). Please login or I was told an easy way to determine if it is an air regulating adjustment, or a fuel regulating adjustment; Before the carb, air mixture. 005" Reply. Jan 5, 2011 · Ok, so on my CB750k3 I have totally rebuilt the carbs. 003) pg47 clymers manual these engines sound like a Singer sewing machine . cut the inner back wall out of your air box, install a 110 main jet, set your timing at full advance, and even a stock CB750 Feb 28, 2025 · is the valve adjustment from manual correct Hi. May 4, 2017 #3 Jun 5, 2023 · Hey there, I have a 1978 CB750k. 005 4 . I like to set the levels using the lowest rim edge of the carbs. Dec 27, 2022 · A 750 (sohc) will give more oomph. friedfish80. Enthusiast; Posts: 162; Valve adjustment question « on: March 10, 2009, 02:59:31 PM 1978 Honda CB750-K CBR F3 Coils Kerker 4. CB750 Administrator (Travis) Staff member. Nov 29, 2024 · CB750 valve/valve guide clearance question Help; Login; Register; Donate; SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: CB750 valve/valve guide clearance question « previous next the intake valve on #1 was worn and no adjustment remained at the rocker. When i measure the feeler gauge with the micrometer it gets to the appropriate measurement( so 0,05mm is 0,05mm+-0,01mm) I started measuring my Step by step engine rebuild video tutorial. 2 grams per nut. Messages 42 Reaction score 2 Points 8 Jul 22, 2010 · I had a 1973 cb750 I overreved one time and backed the valve adjustment nut all the way out, a common problem. 003" and 0. Been so long since I used the OEM valve setting marks I can't say, I didn't like setting like that, probably OK Feb 15, 2025 · SOHC/4 Bikes » Topic: Cb750 valve problems? When you assemble a new engine a beginner can get confused about the valve adjustment. Mar 3, 2025 · The aim is to set the float height at the correct level as per the manual of your particular SOHC/4, as measured from the top of the float to the flat face of the float bowl join of the carb body, with the float valve needle being fully extended in the open position. Where exactly is the fuel leaking from the carb bowls? May 21, 2022 · The SOHC Garage (1969-1978) . 004" as I recall: a feeler should drag but not be immovable when done, remember the locknut will pull the screw back up a bit when tightened) with the rocker at the cam's base circle which is definitely the case at TDC on compression May 12, 2022 · They do make more power but aftermarket support is next to nothing compared to the sohc. So to adjust the idle on these carbs when warmed up, simply turn the adjuster on the throttle cable near the throttle. On my CB 750 I did all this, but still I had some real rattling which I identified comming from the clutch housing. ). Please Home; Help; Login; Register; Donate; SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: Valve adjustment. Welcome, Hello gurus of the SOHC. The DOHC engines use shims for valve adjustment, came stock with electronic ignitions, ignition and alternator are on opposite sides on the DOHC vs SOHC, the DOHC uses solid state voltage reg/rect, different style carbs, plus many other Jan 26, 2012 · SOHC/4 Bikes » Topic: cb750 Valve Guide and valve seats questions. P. . Make the adjustment and install the bowl so you can check it again. Mar 5, 2025 · The manual describes how to turn the cams 90 degrees each time to check certain valves each time (not the engine 90*) . Also cylinder # 3 is not firing. Logged Mike Nixon Why is there never enough time to do it right, but always enough time to do it over? www. I do not know if the chains were heavy duty chains or only the Honda OEM Dec 3, 2017 · The 77 and 78 f engines had well known problems with valve guides and the spring retainers. you do measurable things first i. Dec 2, 2024 · 1. 5mm on my K8 the 77 I don't know could be 12. I finally got my carbs from the shop and slapped them on my "restored" '75 CB750 K5 (quotations because it was a lazy restoration). Jul 11, 2023 I'm not sure how the DOHC valves compare to the SOHC valves (mine are all SOHC, pre '78), but I imagine they are pretty close. Jul 11, 2023 Jun 30, 2015 · SOHC/4 Bikes » Topic: cb750k3 clutch adjustment help Just got done replacing the pads and springs. BadSeedGarage; (SOHC 750) CB750 Honda Chopper, Bobber, and Cafe Racer Motorcycl. Top Contributor. You adjust the tappet clearance to spec (0. 4 days ago · A Corvair at around 120lbs (much bigger valves). According to the manual, with the timing index lined up with the 1-4 cylinder T mark, #1 piston at TDC, I should be able to adjust #1 IN & EX, #2 EX and #3 IN. Then you will NEVER have to adjust the cables on top of the carbs. Odmckee CB750 New member. 004" for the exhaust. Some of the 77/78 K and especially F models have failed when the valve cotter actually pulled through the valve spring retainer. 2 days ago · CB750 Enthusiast. Jan 14, 2025 · The CB750 engine running adjustment procedure first appears with the 1977 750 K7. Just follow the workshop manual. and is bullet proof if well maintained. 00 for shipping ($30. Dime; Aug 23, 2024; The SOHC Garage (1969-1978) Replies 3 Views 574. I will list them specifically for the 1969 - 1976 CB750 SOHC as the mount will only fit these years. Triple Discs The original 1969 CB750 was the first Mar 6, 2025 · In the beginning, the engine was volumetrically designed for a straight-thru exhaust pipe (it was actually a glass-pack in K0 and K1) and a very open intake tract (4 sq. Full Member; Posts: 64 . Since you have pods, take one off a see if backing out the idle knob allows the slides to close completely. Valve Lift". I'm wondering if these valve needles are the wrong ones for this year, and if i need to replace them, or if I just need to adjust to floats more. A quicky valve adjustment and the thing ran perfect again. Top Contributor cb750 sohc `72 engine ticking noise. I have the Hondaman Ignition hooked up to it. 4. Carb Suggestions - 81 CB750 w/ Drag Pipes. “You have to learn somehow”. Mar 7, 2025 · Adjust valve tappet clearance Adjust cam chain Check and adjust clutch What tools / parts would I need in addition to your regular tools (wrenches, sockets, drivers etc) like feeler gages, and rubber gaskets for tappets? where can I get the gaskets from? etc From that point on I now make it a point to drop the oil pan on every SOHC CB750 Aug 28, 2019 · 1980 Cb750c So Im stil new to doing my own wrenching and have just learned about doing valve clearence checks of course after i replaced my cylinders, jugs, rings etc. The camchain should be set when cylinder #1 is 15 degrees past TDCC or #4 is passing TDC WHILE THE INTAKE VALVE IS STARTING TO OPEN, stopping in that forward direction at the "corner" of the spark advancer: that's the 15 degrees point. The later DOHC has a fast idle cold linkage setup but thinking the SOHC does not have that. May 4, 2017 · Once the engine cools I have trouble starting the bike without increasing the turns in the idle adjustment screw. 17mm i think is the size. Eventually Jan 23, 2025 · If you need to adjust the level, turn off the petcock, drain the carb using the tube and remove the carb bowl. Feb 1, 2024 · Its a new diaphram, all the check valves work, interior of the carbs are spotless including the pilot jet, and the mickey mouse ears are open. Messages 1 Reaction score 0 Points 1 Location upstate ny. Jan 30, 2013 · The pistons I am using are domed in their original form. Share: Facebook X (Twitter) Reddit WhatsApp Email Share Link. Feb 4, 2019 · CB750 SOHC High Performance Cam Shafts intake opens before tdc exhuast opens before bdc. 77 cb750k bogs down when throttling cold CB750 New member. Jan 27, 2025 · SOHC/4 Owners Club Forums » Tech Forums » CB750 K0, K2, K23 JDM, K45, K5 And the little ones z50r, xr50r, st90 I'm trying to adjust the valve clearance on a cb550 and the feeler gauge you can get from motion pro is not capable of getting into the exhaust at all. e. No way my run was THAT slow, must be an; Feb 12, 2025 · SOHC/4 Owners Club Forums » Tech Forums » « on: October 15, 2011, 06:43:24 AM » Hi, So the bike is a 73' CB750 that I placed new points on. I had the stock exhaust on mine but had a rust hole in it, so I chopped it right below the foot peg. _____ 1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Jan 31, 2023 · New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly. in. Dec 10, 2024 · First question above: "What is TDCC?" That's "Top Dead Center, Compression" stroke. This is a simple procedure and doesn't require any (SOHC 750) CB750 Honda Chopper, Bobber, and Cafe Racer Motorcycl. The book says to “bend the adjustment arm” to get between 0 and 0. Forums. Engine 2 days ago · SOHC/4 Owners Club Forums I am familiar with the carb balancing procedure using vacuum gauges but I am curious to hear the best way to adjust the mixture screws on this vintage of carbs. CB750 engine life. Bike Idling high with small throttle pull new valves, valve adjustment, coil packs, spark plugs, carb rebuild, pods and chopping the exhaust just behind where your foot sits to ride. I got a micrometer and also a feeler gauge. TideWater2. Basically you need to check the gaps between the valve shims and camshafts. The SOHC Garage (1969-1978) Post New Thread Valve Adjustment/ Cam installment. The bike sat in a barn for about 20+ years but was in good condition. The bike will start, and I have even driven it around a little. 003 Mar 28, 2009 · 77-78 CB750 PD42A Carb Rebuild Info. jpdevol. Adjust the valves (be thankful you have a SOHC), tension the timing chain, check the rubber intakes for leaks. Thinking I burnt Buy your Valve Shim Changing Tool - CB750 - CB900 - CB1100 - CBX from Randakk's Cycle Shakk. 5 mm when carbs are on side? Thanks for any input. I purchased some balancing gauges from Amazon (set of 4 gauges). Oct 3, 2021 Apr 8, 2005 · Some CB750 carbs do have an accelerator pump to enrich the mixture on sudden throttle openings. CB750 K6-76 970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback) CB750 K2-75 Parts assembled to a stock K2 Updates of the CB750 K6 -1976 Jan 10, 2025 · If you need to adjust the level, turn off the petcock, drain the carb using the tube and remove the carb bowl. I was wondering if I could get any advice because yesterday I was adjusting my valves and all were no problem until I got to valve #4 in the back Apr 12, 2023 · Some are setting top dead center for cyl 1 and adjust exhaust and intake for cyl 1, exhaust for cyl 2, and intake for cyl 3. Makes the "sewing" machine louder but suppose to be good for longevity. Messages 3,883 CB750 New member. Thats it. I took off my bowls to put in new needles (I was having leaks) and noticed a couple of tiny bits of crap in the bottom of the bowl. alot of times those tappet covers ger cranked down way to hard. for stock camshafts. 3 timing mark lines up and adjust "3's tappets Oct 15, 2023 · For Sale - Four Honda CB750 K SOHC 1969-78 Exhaust Valves -used. Author Topic: Cb750 K1 Seat Adjustment? (Read 1073 times) 0 Members and 1 Guest are viewing this topic. Then rotating 360 degrees for cyl 4 to be at top dead center again and doing the rest of the valve adjustments left. The plunger bar is a machined fit in the hole of the housing. More clearance and you will be 'hammering' the ends of the valves as well as the cam followers. Author Topic: CB750 Clutch Adjustment (Read 29696 times) 0 Members and 1 Guest are viewing this topic. Valve pulls through the retainer=valve and piston collision. SOHC 750 is a Nov 9, 2012 · So back to my main reason for the thread, adjusting the valves is there a difference in tolerances for the 750 and 836 kits meaning its never been out of the frame. Sep 20, 2020 Valve Adjustment/ Cam installment. Then Feb 28, 2025 · I decided to just move forward and adjust the valves. Backed out both the handle bar adjustment and the casing adjustment. So ive done my May 30, 2019 · After the bike ran for 6seconds Exhaust 1&2 were hot while 3&4 were cold. 2. Messages 191 Reaction score 72 Points 28 Location England. Honda must think that 90* cam movement is Dec 2, 2024 · Rotate the engine half a turn only till the T 2. When opening full throttle the arm stops just short of contacting the pump rod bottoming out on the idle adjustment housing notch. Jan 17, 2024. SOHC/4 Owners Club Forums. Problem is a loud ticking from the what it seems is top of the motor on the right side. Mar 7, 2025 · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: How do you adjust the CB750 '77-'78 idle mixture screws? « previous next » Print; Pages: [1] Go Down. Top End4 hours LONG!Cam timing coveredIgnition point gap & timing coveredInspection and measurementsValve adjustmentBottom End5 hours LONG!Main & rod bearings clearance inspectionTransmission rebuildClutch rebuildOil pump rebuildInspection and Sep 3, 2010 · To have a real smooth running engine, all adjustments has to be done properly and in the correct order. moaralpha. 43. They have been machined to create valve relief and coned to create a specific compression ratio (CR) for alcohol, much higher than gas burners. Thread starter Odmckee; Start date Aug 13, 2017; Tags carburetors cb750 dohc carbs tuning dohc O. 006" on the exhaust valves. motorcycleproject. I go to adjust the clutch and after a while of messing with it, I still can't feel any resistance at the lever. You can just turn ONE adjuster to adjust the idle on all of the carbs. I'll measure my existing shims and adjust as necessary up to 0. New posts Search forums. While there thought I remove the valve cover and send it off to have it chromed. 0004- 0. The mechanic did a valve adjustment, I guess it wasn't done well. scondon. 3. This is an important step before synchronizing the carburetors. and ex. Messages 3 Reaction score 0 Points 1 Location Massachusetts. Please login or but I'll check for any debris causing the valve to not seal properly Logged 1976 cb750k 1975 cb750 f 1977 xs750 Jun 24, 2018 · Carbs and motor were completely rebuilt, chain and valves adjustment have less than 1000 miles on them, the carbs have been rebuilt and have had everything replaced, the bike ran perfect for a while with the carbs like that, they were just bench synced for now but it ran great has a new inline fuel filter and has never sat for more then a few days without being run so Feb 26, 2016 · SOHC/4 Bikes » Topic: Vacuum Synching CB 750 Carbs. On both cylinders, even with the adjustment screw backed all the way in, the rocker is sitting tight against the Mar 6, 2025 · Measuring valve timings requires very accurate Lash adjustment. Float Needle Valves; Idle Adjustment Screws; Performance Carb Nov 19, 2024 · Adjust all the valves to to . You can torque them up not tight at all yet they apparently in use get even tighter to be almost have to be blasted loose. Thread starter loxley007; Start date Oct 15, 2023; loxley007 CB750 Addict. Many people have never ridden a well tuned cb750. Having difficulty getting 15. Jan 25, 2025 · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: Cb750 K1 Seat Adjustment? « previous next » Print; Pages: [1] 2 All Go Down. with the float valve needle being fully extended in the open position. I think this was more or less a race CB750 SOHC engine. Loosened the clutch nut on the arm and used to a screwdriver and turned "Till I felt resistance" then backed out 1/4. Aug 25, 2024. With the bike on the kickstand any oil in the sump should be on the left side anyway. 005 3 . the lapping I would think it is as much by sound as it is by feel with tool when the gritty grinding noise goes away adjust tool and compound and continue. On the CB750, the lowest edge is closest to the cylinder Aug 8, 2013 · The SOHC Garage (1969-1978) . 005, buy / borrow different (good working) compression gauge and do the test, go from there. Sep 20, 2020 · CB750 New member. Unless specs have changed for later models and I missed it,correct valve lash for 69-78 CB750 K and F is . Apr 3, 2024 · It isn't possible to listen to the engine and adjust the air screws for 'best idle', for example, primarily because the cylinders interact. B. Do not remove the feeler yet, keep the adjustment screw on hold with the screwdriver and fasten the locknut. valve adjustment, plug gap, point gap and timing Sep 29, 2017 · The SOHC/4 Technical Documentation Library is a service of the SOHC/4 Owners Club. Adjust the valves of EACH cylinder when that piston is at TDC and both cam lobes on that cylinder are pointing DOWN at approximately 45º angles. Reply. I vividly remember the extra torque needing an adjustment to how I handling it previously. Always use a new gasket and NEVER use RTV silicone on any gaskets. I measured the replacement valves and guides as you did while May 30, 2017 · It's hard to hear it for sure in the video, the bike doesn't have any type of air filter on it and has an aftermarket header and straight pipe I know that doesn't help much, the noise is defiantly top end noise, doesn't sound like a rod knock and doesn't sound like an old v8 with mechanical lifters, I was thinking about it and the cam didn't seem to jump when coming off May 17, 2022 · Valve clearances 3 and 4 thou (1 thou large after reading the internet) The bike runs fine (static on stand) and seems ok however when I checked carb sync with a new set of vacuum gauges the reading is 10 (across all cylinders) instead of the advised 20 Hg expected. Testing Cylinder #4 at the start was fortuitous, because if I had started with cylinder #1, I would have found that the timing was spot on and started scratching my head again and looking elsewhere. Compression is good on the cylinder and the valves are moving and within spec as far as adjustment. Cam chain adjustment. Jan 16, 2024 · Yes, this is a common "upgrade" due to the larger cutout in the earlier valve stem for the valve cotter as well as a wider angle where the earlier valve cotter seats in the valve spring retainer. 00 . Good thing I finally got Feb 28, 2025 · And the CB750 SOHC valve cover gasket can indeed be replaced without removing the engine, with no ill effects. Dec 31, 2016 Jan 31, 2025 · SOHC/4 Bikes » Topic: Valve Author Topic: Valve adjustment question (Read 6334 times) 0 Members and 1 Guest are viewing this topic. Running slightly rich is preferable to running lean. There is lots of info online too. SOHC 750 is a community dedicated to 1969-1978 Honda SOHC CB750 Choppers, Bobbers, and Cafe Racers. It doesn't cover the cam Forums. Andrews had a page on determining installed height. I did a valve lash adjustment and did another compression test. Please login or carbs, valve adjustment, tune , etc. Position of High Point of VALVE LOBE when using feeler Gauge. 3 timing mark lines up and adjust #2's tappets Rotate the engine half a turn only till the T 1. Jul 16, 2023 · im liking the cam chain,,, when the intake and exhaust valves are set to to spec ( intake . Messages 2 Reaction score 0 Points 1 Location Compression test first as most of them never get the valves set, then the owners tear apart carbs all day long for nothing. CB750. I fear the skinny gauge will snap from the bolt and end up in the valve area. 3 days ago · Listed below are manuals that have been sent in to share with the CB750 community. Welcome, Guest. The SOHC Garage (1969-1978) . Valve tappets adjusted properly. C. What am I doing wrong? CB750 K6-76 970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback) Mar 22, 2009 · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: CB750 Clutch Adjustment « previous next » Print; Pages: [1] Go Down. Start with all 4 screws at 1 turn out and then adjust accordingly after riding the bike, assessing colour of plugs, clean plugs, adjust mixture, ride and repeat until you are happy with colour. I set the float level according to the manual (26mm from the body to the lowest point on the float), but when I park the bike it seeps gas out the overflow (slowly, but surely) if I don't turn off the stopcock valve. Aug 9, 2008 · Now, simply loosen the locknuts on the tapets that are loose, turn the adjustment screw counter clockwise a bit and slide in the 0. 2) The throttle valve controls mixture from May 7, 2017 · Don't follow the manual's procedure. The bike had been sitting for about a year with occasional starts. Apr 13, 2023. checkflag. Dec 9, 2019 · 78 CB750 K Valve Cover Removal. CB750 Guru. Apr 25, 2020 · The rod rests on the control arm when the spring is out. 2 ex. Jan 17, 2024 #3 Honda CB750A Hondamatic Shop Service Repair Manual (converted to be searchable) - from Hondamatic. Dec 16, 2024 #9 BAHNST said: Mar 7, 2025 · Keihin put the mixture screw on the carbs to achieve critical adjustment of each carb. The bike ran fine but sounded like someone was hammering the engine from the inside out. kevinr13. We are your #1 source for Honda Vintage Motorcycle Parts. excersize caution if your going to do a valve job. 1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A Apr 20, 2020 · The valves CANNOT be ground, seats can, replace valve only at like $25 each, you will discover this engine to be very expensive to rebuild. Dime. Compatible with all other stock parts. Zero CB750 Member. The RC 315 cam in my unit is set at . 1 valves are loose and can be moved slightly with your fingers then that is the cyl. Messages 16 Reaction score 18 Points 3. CB750 Member. I have a 1975 Honda 750, the timming, compression, valve adjustment, and carb cleaning, new battery, plugs, and tested coils have all been done to spec. Thread starter ejohnston; Start date Jul 27, 2012; Tags engine sohc E. One of the little joys of owning a SOHC CB750 « Last Edit: December 09, 2019, 10:01:22 AM by ekpent » Logged mrmach5. « Last Edit May 8, 2017 · This make the idle adjust knob ineffective. I mean it is very tight, less clearance than a valve in a valve Jun 8, 2017 · Advancing My Timeing / Valve adjustments (CB750k8 or 1978 CB750K) SOHC/4 Owners Club Forums. Cam chain tensioned properly. Turn the screw in until the Apr 9, 2017 · Hello all, I am new here - I have come across a problem in the rebuilding process of a DOHC CB750 and I don't know where else to go! A little background about the bike: 1979 CB750K DOHC engine fit into a SOHC frame, mileage is unknown, started to make cam noises (spinning noises) so removed cam cover and cylinder head to inspect. 002in exhaust . MCRider Jan 25, 2025 · you want the valves closed at the same time to adjust them,forget the manuals do it like this,for any cylinder,,rotate the engine by hand and watch as the inlet valve goes down,keep turning and watch as it comes up,once it stops coming up its closed fully even though your still turning the engine over,,now look at your timing mark and bring the Feb 11, 2025 · It is important for the exhaust valve tappet clearance to be a bit larger than the intake valve tappet clearance when cold, as at normal running temperature, the exhaust valves are quite a bit hotter, and therefore expand a bit more which causes the valve stem length dimension to grow a bit, and this effectively tightens the valve clearance. « previous CB750 K3 crat | (2) 1986 VFR750F. maybe $25. Found a winner that was still in the frame of a Custom that had been stored in a garage since 1995 with only 12,000 miles on the clock. Jul 13, 2019 · This is the valve used to adjust the vacuum. It showed 90-95 psi across the board But I also did it with the engine warm this time. Also, is the hole in the end of the piston housing Forums. Enthusiast; Posts: 207; Re: More Insanity!, did a May 11, 2016 · CB750 Idle issues (I'm flabbergasted) SOHC/4 Owners Club Forums. 002 feeler under the adjustment screw (#1 intake). #1 Hello all I am new to the site. chuckt52 CB750 Member. This meant that the exhaust valve is larger, relative to the intake valve, than most of today's engines. Last edited: Jul 9, 2017. I am not 100% positive that the brass valve causes the problem, but I have tried to find that part in order to replace it. If you have additional manuals Forums. Login; Join; HOME (SOHC 750) CB750 Honda Chopper, Bobber, and Cafe Racer Motorcycl. Most ports are all pretty out of whack mostly tight so my crank shaft is pretty hard to rotate. Jan 10, 2025 · 2025 Honda CB750 Hornet: AFFORDABLE AND FUN TO RIDE. Jul 31, 2021 · However, my question is on valve clearances. Messages 3,476 Reaction score 56 Points 36 Location Fort Worth TX. The way Terry described worked fine for me, as the spring in the valve is strong enough to hold up the float assembly without being High Performance Valve Springs for the:• Honda CB750 SOHC 8 Valve (1969-1978)Honda DOHC CB and CBX Valve Springs are available in other listingsDual Spring Kit includes 8 Outer Springs and 8 Inner Springs. Thread starter pipbernadotte; the slides also lift in relation to the engine ring and valve seal and vacuum and they then drop to make for sluggish action. The Idle Mixture Screws (IMS) are adjusted for maximum lean conditions or fastest idle speed in this case. I have done several valve adjustments trying to get the pressure readings to improve but it’s doing the complete opposite. carbs? I know that I may have to readjust the synch once this is done, but I want to make sure I am doing it right! Valves, camchain and timing are all 73 CB750 Oil Tank breather spews oil when throttling SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: 73 CB750 Oil Tank breather spews oil when throttling « previous next a tight valve adjustment may be your compression problem. According to my research that indicates a valve timing or air-leak problem. Points gap, timing, spark plugs, valve adjustment, cam chain tensioner adjustment and finally the carb synch. Author Topic: cb750 Valve Guide and valve seats questions. CB750 Addict. Expert; Posts: 1,167; ya read the book the motor can be 180 degrees out even if 1&4 marks lined up,you have to remove the valve covers and check the valves on 1&4 they should be play Mar 7, 2025 · Top dead center of valve 1 plus 15 degrees. The F heads have been "fly cut" to increase the chamber size to avoid piston interference and adjust the CR. FORUMS. I saw on an older thread that Motion-Pro has a bent gauge so I would get those but not sure that will do it either. Also, the bike now pulls to 10,000 + RPM Oct 2, 2017 · SOHC/4 Bikes » Topic: Last adjustments with valve cover off and I can see when the rocker arm is on the cam's base circle, other side of the lobe. I cleaned the tensioner during the rebuild, not sure of the adjustment process. 060 + Max. 050 inches of valve lift. It's not hard to do but very fiddly, best bet is to get yourself a manual. The mount fits into the large hole on the carb. It's a bummer: it just came back from the shop. 004" on the intakes and . I'm waiting to adjust throttle cable and vacuum sync because of Jan 19, 2017 · Cognito Moto CB750 AIR INTAKE BOX SOHC AND DOHC. « previous next » Print; Pages: [1] Go Down. 5. No lifter arms or shafts needed. Specifications, Technical Features; Part 2: Service Information, Inspection & Adjustment; Part 3: Engine Removal & Installation, Cylinder Head & Valve Mechanism, Cylinder & Piston; Part 4: Oil Pump & Regulator Valve, Valve Shift Mechanism, Transmission Jan 11, 2024 · Honda CB750 SOHC Service Repair Shop Manual 1969-78. Looking to buy a cb750 sohc. Apr 6, 2024 · Valve adjustment. 4. Everything checks outs, and carbs have already been cleaned Aug 5, 2020 · Yeah, that's what I was thinking too. Ira. Jonda explained the easiest way to not screw this up. Bad idea and wish I never had. 003" Ex. youve done everything else Nov 15, 2024 · Hey everyone I have a 1972 cb750 sohc chop. Hard start, kick and kick CB750 New member. Nov 18, 2012 · Well, my '81 CB750 Custom with only 39,000 Miles ran out of timing chain adjustment, so after looking at the cost and hassle of replacing the chains, I opted instead to buy a "new" engine on Ebay. oil just changed, valve clearance is set. Phil B; Jul 27, 2012 · The SOHC Garage (1969-1978) . (Read 10225 times) 0 Members and 1 Guest are viewing Aug 14, 2020 · Hi, I just bough CB 750 K0 and want to check and adjust valve tappet clearance. May 22, 2022 #3 not good. Messages 3 Reaction score 0 Points 1 Location Ontario. The compression test with added oil will help determine if the problem is the rings or the Jul 27, 2017 · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: CB750 Cylinder/Exhaust Temps « previous next » Print; Pages: [1] Go Down. again screw tappets will need regular adjustment on the 750s as per the smaller wetsump 550 you had. ENV-321 $79. Please correct me if im wrong . pdf") -- I finished my valve tappet clearance check/adustment today after some distractions the past 2 days. Makes this task about as easy as it can get. And then do a vacuum sync to make the other carbs match your master. Staff member. Non stock camshaft valve lash can vary. Donate; SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic: 77-78 CB750 PD42A Carb Rebuild Info and that adjustments can be made to the idle with the pilot screws, Dec 17, 2014 · I been tweaking my points and valves, and with some time I Forums. Then other people are setting top dead center for each cylinder they are about to adjust. Messages 29 Reaction score 0 Points 1 Location Spokane, Wa. If it is stuck what do I need to Apr 22, 2024 · Learn how to adjust the valves on a Honda CB750 Four. intake opens after bdc exhaust closes after tdc. Aug 14, 2024 · I adjust for a pretty strong drag, hold the adjuster back so the nut doesn't turn it (with a little driver with a square hole tip that fits the adjuster that I got somewhere 40 or more years ago) and tighten the nut securely. What's new. May 13, 2012 Sep 14, 2021 · Hi there, adjusting the valves is important and can be done yourself with basic tools. 8 hours ago · SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Bikes » Topic - 1972 CB750 K2 - Brier Brown Metallic - 1973 CB750 K3 - Flake Sunrise Orange - 1974 CB750 K4 - Flake Sunrise Orange I did a valve adjustment, points adjustment, made sure the spark plugs were gapped correctly. Tightened it up a bit on the handle bar. Is this going to be a big Jul 5, 2017 · Take a valve adjust cap off of cylinder 1 and cyl 4 so you can verify oil getting to both sides of the cam. Or make one. 4mm clearance between the rod and the arm. Messages 437 Reaction score 59 Points 28 Location Sunny Central Florida. Messages 4 Reaction score 1 Points 1 Location Hudson, WI. so what if i adjust by changing the float height that Honda found works best? That didn't work, their slow jet must need to be bigger/smaller. Manual states height should be 15. Testing Cylinder #4 at the start was fortuitous, because if I Sep 14, 2021 · Hi there, adjusting the valves is important and can be done yourself with basic tools. jamesb. make sure you use a 6 point wrench or socket when you try and remove them. My tester Feb 17, 2023 · I’ve watched five or six YouTube videos on balancing carburetors for a CB750. The retainers have been know to fail under 10000 miles. CB750 K6-76 970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback) CB750 K2-75 Parts assembled to a stock K2 I adjust valves to Hondaman recommendation - 0. pdf. Full 2 days ago · CB750 carb issues - rich at stock setting and poor Cam chain was replaced when I rebuilt the head a couple of weeks ago. If no. In the manual is writte IN 0,05 mm and EX O,08 mm. A slight 'tick' is better than quiet. 0006 (0,10-0,15mm) to make the numbers below closer to each other. Turn the adjustment screw clockwise, until the feeler can be slided with a slight resistance. No need to find TDC, the cam positions are easy to find by reading the manual. Nothing for a CB750 size motor. SOHC Honda CB750 Manuals (1969-1978) CB750; Jan 11, 2024; The SOHC Garage (1969-1978) Replies 3 Views 3K. Several people including a professional Honda mechanic told me to do a valve adjustment and check my pressure readings. Messages 26 Reaction score 0 Points 1 Location Canada. The exhaust valve guides definitely did wear out under Aug 28, 2019 · Hey Guys, I finally got around and started the valve clearance job. 2 days ago · SOHC/4 Owners Club Forums » Tech Forums » Pages: [1] 2 Go Down. Messages 247 Reaction score 137 Points 43 Location Belleville, Arkansas. Nov 3, 2023 · Mark's book is very good and I have a copy for my stable of SOHC's, but is also very specific to the SOHC. (69-78) 1. but maybe I can find a video for the SOHC bikes. Anything you want to do with the sohc, parts are available for the most part. Enthusiast; Posts: 132; How do you Nov 26, 2022 · Honda CB750 SOHC (1969-1978) Discussion. 5 mm, but unsure if this is with carbs lying flat or turned on side. Sep 21, 2020 · CB750 New member. 4 days ago · USE that adjuster to set the idle from now on. 5 so check your manual for that. -----Jim 1979 kz1000b ltd stage 3 cams pod Mar 6, 2025 · Topic: cb650 valve adjustment problems Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985. Feb 7, 2025 · They are now available for your go-fast Honda CB750 SOHC project. Jul 14, 2019 #3 Clymer manuals, especially the ones for the sohc bikes are best used to soak up any spilled Jul 11, 2023 · CB750 Addict. Please login or register. very thin layer of hardness. Oct 15, 2023 #1 Hi, for sale: Four Honda CB750 K SOHC 1969-78 Exhaust Valves - used. Now is the start of issues with some plates. SOHC/4 Owners Club Forums . Apr 30, 2023 · The SOHC Garage (1969-1978) . Jul 12, 2018 · According to the shop manual, you adjust the exhaust valve on #2 and the intake on #3 at the same time. ejohnston CB750 Enthusiast. Basically you need to check Jul 4, 2014 · I'm slowly going through all the maintenance items the previous owner neglected on the car (mismatched spark plugs, maladjusted clutch, burned out bulbs all over, chain not Nov 15, 2024 · I adjust them in the first place because there was a pretty loud tick coming from the right side valve cover! But the bike runs great other than that. Thank you to everyone who contributed. Stenberg72; Jul 16, 2023; The SOHC Garage (1969-1978 5 days ago · Do not adjust the CB750 with the adjustment loosened unless you want to rebuild the engine because you bent a couple valves. It's relevant for the Honda CB750, CB900, and CB1000. Apr 7, 2021 · I am struggling with carb #1, any attempt to adjust the float, it overflows. however, I am experiencing an issue with it the I'm not 100% certain about and would like to see what you guys 3 days ago · Air Screws on the CB750: Let me see if I got this right. But it seem strange to me - sheet of paper is 0,1mm so such a 0,05 mm is practically no clearance Jun 22, 2022 · Surely you adjust with the cam lobes pointing downwards as this does allow exhaust 2 and inlet 3 to be done at the same time? I have read about 50 threads on this site and SOHC site and lots of people seem to come across Jul 2, 2016 · The stock 76 valve needles are all metal, with no clips attached to the floats like the ones shown below. Full Member; Posts: 20 I would do valve adjustment! Logged moaralpha. Could it also be a loose cam chain? Reply. 012" IN/Ex. Staff member Jan 22, 2009 · Re: cb550 valve adjustment « Reply #3 on: January 22, 2009, 04:08:09 PM » Thanks,I had measurements all over the place. Less clearance may be quieter, but will burn the valves and you will need new ones. Maybe more. valve timing is checked with zero valve lash @ 0. Mar 5, 2025 · hey folks. Mar 4, 2025 · - Did a valve adjustment - Checked charging system Things I have not that done (that I can think of): - Have not synced the carbs using sync tool (it is bench synced though) - Have not Current Setup:-Dyna Coil 5 ohms-Dyna ignition-NGK spark plug cap-D8EA (i have tried denso prior with same result)-7mm copper core wire-#40 slow-#120 Main Aug 13, 2017 · Cb750 carb adjustment help. 1 in. check your cam sprocket teeth and if all else fails it can only the cam chain OR a bad tooth on the crankshaft sprocket . I checked carb synch, timing, points and valve settings, to Mar 17, 2017 · Cb750 carb overflow wont stop leaking. If it doesn't seat, then adjust the syncro adjust for that carb, and lock it down, call it the master. 05 mm feeler. com. The manual states that you need to find tdcc on the no. intake holes). Messages 48 Reaction score 0 Points 6 Location Middleton, Wi. Honda CB750 SOHC High Performance Valve Springs & Details. CB750 K6-76 970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback) Seems to behave like a straightforward air screw. 4 timing mark lines up and adjust "4's tappets Rotate the engine half a turn only till the T 2. 1 Header w/ turn down Maxi-Dwell Ignition Foam Air Filter Pods Sep 17, 2011 · The way you're describing it is exactly how I ended up setting the floats, with the float valve fully seated and the tang on the float assembly just barely touching the spring-loaded pin in the center of the valve. SOHC/4 Owners Club Forums » Tech Forums » Project Dec 20, 2024 · I followed the manual (specifically, pages 42 and 43 of the fsm I downloaded from the 'Manuals' section of the SOHC site, filename "Honda CB750 SOHC K0-K8 F1-F3 Shop Manual. 3 in. The cracked tube has been mentioned by DaveBardier so check that Knowing where the leak presents its self will help is it at the bowl gasket or the drain. Here is a simple way to not get confused. Mar 6, 2025 · Measuring valve timings requires very accurate Lash adjustment. Covers the SOHC models 1969-1978. Author Topic: Easy CB750 cam chain tensioner adjustment idea--what do you think? (Read 21977 times) 0 Members and 1 Guest are viewing this topic. This section will provide some basic guidelines, spring pressure Nov 5, 2024 · SOHC/4 Owners Club Forums » Tech Forums » So I am putting my motor back together for the first time and trying to do my valve adjustment. May 16, 2022 #3 buy 1991 through 2005 nighthawk they use hydraulic lifters - no valve adjustment Jun 7, 2013 · This seems to be important. Nov 5, 2012 · cb750 valves are paper faced. 6) Turn the crank over 360 degrees clockwise (always Sep 8, 2012 · If the no. Turning in restricts air. SOHC/4 Owners Club Forums » Tech Forums » SOHC/4 Mar 8, 2025 · SOHC/4 Bikes » Topic: Well after almost 28 years of CB750 ownership, I had still not discovered a suitable tool for removing the really stubborn ones, even my special "Metrinch" sockets and spanners (Simply the best tools in the world, and more surprisingly, they're English!) would rip ther corners offa them. Author Topic: How do you adjust the CB750 '77-'78 idle mixture screws? (Read 12380 times) 0 Members and 1 Guest are viewing this topic. Messages 46 Reaction score 2 The factory Honda manual for the cb750 says adjust valves every 3,000 miles, I have a bigger cam so I check every 1000 but rarely need to change the clearance. Timing advance works fine and no intake leaks. Mar 8, 2025 · Now the float adjustment it is 14. I completely rebuilt the carbs: tore them apart, did ultrasonic cleaning on every carb body and parts and rebuild everything with rebuild kits (new seals, jets, etc. Jul 15, 2015 #3 Adjust the valves (be thankful you have a SOHC), tension the timing chain, check the rubber intakes for leaks. 1 valves are tight and no. The retainers have a steep angle plus poor metalcommon issue on the f motor. No dice. I have no electric Dec 31, 2016 · It's a 1970 sohc . 633. being heavier the 750 will magnify the handling shortcommings of these early inline 4s if not upgraded or at least reconditioned after 50years(imho as i remember May 22, 2014 · You dont have to drain any oil as the 750 is a dry sump motorall oil is in the oil tank unless you have a bad check valve in the oil pump. 3 MB · Views: 929 Reactions: larry-howard, HodakaDan and pickleknuckles. Then "Calculate INSTALLED SPRING HEIGHT (min. D. Honda CB750 Valve Adjusters (New!) Valve adjusters have a tough life and are usually pretty beat up. It seems to be straightforward with using the adjustment screw to balance each carburetor. Took up all the slack with the case adjustment. Welcome, Guest CB750 K6-76 970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback) And for a sohc you cant advance exhaust without advancing intake or getting a special ground cam. Sep 21, 2020 #1 Looking for proper procedure to set float height. 1 4 days ago · OK to check the timing with actual valve lash and adjust more lash on some valves to make all 4 closer to each other? Cyl 1, 3,4 IN need more lash. For whatever reason, Honda never published a shop manual supplement showing that a running adjustment was to be used on the K0 to K6 models. I did a compression test on my 72 CB750 with 11k miles and I got only 90 psi on all cylinders. I just bought a cb750 1974 with 13k miles. Universal Cafe Racer Parts. Cyl 1,2 EX little bit more too. Logged blew the cases, crank etc etc. NOT internet. At the back, a Showa shock with 10-step preload adjustment connects via Pro-Link to the swingarm. 002" In and . tbdn ltqhtyl qwiyx cceotr gkhhfo xbojjo iahtyz dbzfa jraibt jfhkd fuxog umxb ltth jxze qzre