engine

I need some help. I've been struggling with this problem for about a month. I have read various posts and articles continue to suffer from a high idle when my bike is cold. I bought this bike and it didn't run. It's a 1979 Honda CB750F (or so I was told). When I bought the bike there was a hole...

I have an issues with my 1982 Honda CB900F. I rode it today through some slow traffic for about a half hour and noticed some some smoke coming from my crankcase. It seem that once the bike gets hot enough it begins to smoke from the crackcase emissions port. I have pod filters on the bike so the...

Hey forum, Background: Currently doing a lot of basic maintenance on my 1982 CB750f, my first post here was a few weeks ago and you guys were great help so here is another question for my current problem. Ever since I got this bike the idle has been 'hanging' high only when the engine is...

Has anyone ordered and used a Big Bore Kit for the SOHC CB750? I'm thinking of doing an 836 and could use some suggestions and ideas. What works, who make the best kit, where to get machine work on the East Coast...

Hi, I just bough CB 750 K0 and want to check and adjust valve tappet clearance. In the manual is writte IN 0,05 mm and EX O,08 mm. But it seem strange to me - sheet of paper is 0,1mm so such a 0,05 mm is practically no clearance (and the gauge is really thick(er) than a paper). Is not it a...

1975 CB750 basket case rebuild in progress (no idea how man miles on the engine, came with 2) (pic). Cracked the cases (first time doing so) and right away noticed the primary chain on the clutch side appears to have less tension than the inner chain (pic) - sounds like this may be normal after...

When you Sinc your carbs, all things being equal, what are your readings across the gages? Mine all fall in about 20 inches at idle when all are adjusted. It's the last thing I do after cam chain adjust, plug check, point gap and timing check and mixture check. Just wondering what everyone else...

Hey everyone! I finally got around to making an account so I could ask this question, and probably a million more later on. BACKGROUND: I bought this motorcycle and it was completely torn a part. The valve cover and valve body was off the motor and the cylinder head was still on the motor...

Hello Everyone, I have owned my 78 CB750 for a few years now and have constantly been chasing down an oil leak. I think I have narrowed it down to the circular cover that is appears to be held in place by an extrude from the oil pan (I attached an image for clarification). I was wondering if...

Hi CB750 community! Just drove this 1978 CB750 home and 2 miles from home a ticking sound started. Does anyone recognize what could be causing it? https://photos.app.goo.gl/XvQUh5RbCnSvUL6w7

Hi folks, I’ve just purchased a 92 F2N to convert to a cafe along the lines of kaspeed. I’ve been talking about doing this for years but haven’t had the time. So I’ve decided to make time to do it. It’s my first ever project so I’ll probably be asking loads of questions and asking for advice...

Hello! I just finished replacing the exhaust camshaft on my 1979 CB750L and now I’m having issues where the bike won’t idle or stay running without the choke lever pulled fully out and doesn’t seem to rev above 4000. I ran the bike before doing the replacement and it started up great (forgot to...

Hey guys new here I have been looking around the forums for ideas but I have had several engine and carb problems over the last year with this project. I have a DOHC 81 750C I am currently dealing with a no start issue after fresh piston rings, top end gaskets and seals. I believe it’s timing...

Hello to everyone. I am new to the forums here. I am looking forward to learning as much as possible and making new acquaintances. With that said, here is my dilemma: I recently came into a '79 CB750K engine without the carb assembly. Just the engine. The cycle shop that sold it to me stated...

Hi guys, I just tried to hone my cylinders but I wasn't getting 45 degree cross hatching so I stopped. It looks flatter, closer to 120 degrees. Why is that? Am I not moving the hone in and out fast enough? Or is the drill spinning too fast? Before...

Hi all, I removed the alternator cover to polish it and "brush B" seems to have snapped off. What does it do? It seems like a switch or a button but I'm not sure. Is it sufficient to super glue it back on or do I need to replace it? Thanks.

Hi Gang, I have a 93 NH750. The number two cylinder is not working, but the compression is 85. I completely cleaned the carbs. Full tear down, carbs separated and cleaned with new jets installed. Brand new plugs. Swapped plug wires. Nothing worked. Compression in 1,3 & 4 is 60. I am pretty...

So can't find any marks anywhere on engine case or crankshaft,how do I decide what bearing sizes to use I was told to use plastigage but what clearance would I need thanks in advance

Have put primary gears together and tightened end bolt but floating gear on the end does not line up with clutch cog so when you turn clutch gear lifts out.am I tightening end bolt to much or am i missing something hope you can help

I took apart the side cover and the gears fell out with the cover. The big gear spun freely a few teeth. Is this timing related at all or anything? Or can I just put them back in and close the cover?

I am having trouble setting the cam chain markings to set timing can anyone help

I have a '76 CB750F SOHC that I bought about 8 or 9 years ago. I installed air pods, and swapped the original muffler for something louder and smaller. I had the carbs rejetted for the modifications. Since the engine is now breathing easier, i have noticed that the rpm's seem to be quite a...

Hello, I bought a 1982 750 Super Sport last week. The exhaust has big holes in it on the underside. As part of the deal, I got a new, still in the plastic bags, MAC 1-1609 exhaust set. When I look at the MAC Performance website, I see that the recommended exhaust set is 1-2609. The 1-1609 is...

Hello everyone, I am new here, so first up something about my bike. I bought a CB 750 KZ '79 DOHC with 80.000 KM on it last winter. It's my first 4-Stroke motorcycle, but I was repairing/restoring some cars before that and wouldn't call myself unhandy with vehicles in general. The bike was...

I'm looking to repair a stripped out cam cover bolt on an '82 CB750. Can someone tell me what helicoil I need to do the job, is it an M6 x 1?

Hi guys, Recently I've bought a CB750C from 1983 but I'm a bit disappointed that I only get him to max 110-120km/h in 5th gear at 9000rpm. As I read here on the forum and on the internet that he should go a lot faster, the motorbike has been modified and rebuilt by an unknown person. Can...

Given a 1977 CB750K Stored in garage hasn’t run since 1987. compression 135 to 145. Carburetor must be rebuilt. New battery everything appears to work. Can’t figure out why after changing oil the tank oil won’t go into engine. Want any wisdom on the possible new project

Hi Gang, First post! I just bought a 93 NH750. 22K miles, 1200 bucks. Bike is in pretty nice shape overall. I have not put many miles on it yet, but I notice that the bike kind of hesitates at the bottom of 1st - 3rd gear. When I start off in first, there is a slight hesitation and then when I...

I'm interested in getting a honda cb750f supersport, and I found one listing on craigslist. Under the description, he mentioned that the bike has problems at higher RPMs so I messaged the seller and asked him about the "higher RPM issues" to which he replied with a video showing some engine...

Working on non-running 82 CB750SC/Nighthawk. Replaced Coils and now firing on 4 instead of 1 cylinder. Still kills with throttle. Guessing Pilots. In meantime I wanted to check valve lash as I see many suggesting this is critical. spec is .08mm +.05 so 8 to 13, both intake and exhaust. All...