dohc

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...

Hey my first project a cb750c 81 is almost finished and i'm test riding to fine tune everything. The bike is running ok but it need some improvements. Maybe you guys have some tips :) I'm playing al little with my ignition. So if i understand the tuning with the timing light. The arrow has to...

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...

Hello, all. I'm looking for hose and cable specs/dimensions for 1980 CB750. I can't seem to find proper lengths for cables and lengths and inner and outer dimensions for all the hoses for my 1980 CB750. Can anyone please help me out?

New member here! I recently acquired a 1979 cb750k on the local classifieds--not running, but otherwise in great condition with 12k miles on the odometer. I have no experience with older motorcycles, particularily carbs. The throttle was "stuck" and I discovered (after pulling the carbs out)...

Hi Gang, Jut got my vacuum gage and am getting ready to sync the carbs on my 93NH. The instructions say that I should have the choke full on while doing the sync. I have read a bunch of info on the net and watched a number of videos on carb syncing and I have never seen anyone have the choke...

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...

I need a rear tire. The current mounted tire is 4.50-17. Tire dealers I have searched state that the rear is 18". Even Partzilla shows it as an 18" tire. This bike is all stock with the Comstar wheels. Cannot find a 4.50-17 vintage style tire anywhere. What would be the proper metric size....as...

Hi I’ve got a 1982 Honda CB900F Super Sport a that is having charging issues (I also plan to switch to an antigravity lithium ion battery but currently I am still using a New Lead Acid Battery in the Bike) Currently at idle it only puts out 11.7-11.8Volts DC & @5000 just barley hits 13.1-13.5...

Hi I have just finished rebuilding a 1980 CB750K it runs well but is quite rattly, its had new cam & primary chains. I have replaced the rivets on the clutch basket gear with bolts and there is no slack now. The question i have is how much end float to expect on the when its assembled, there is...

Hi all, I have a couple bearing questions. I just installed my new steering stem bearings and I cant seem to get them seated all the way. I have the motion pro steering stem bearing driver and I'm whacking it as hard as possible but it won't go that final mm. What should I do? Should I freeze it...

Hi people! First time on the forum. After owning and working on a CM400T for the last years im now working on a 1982 CB750f project (EU). While in the process of doing general inspection and maintenance using the FSM I cleaned out the bottom end of the carbs using carb cleaner and put in some...

Hey, Just picked up a 1981 cb750c. The #1 carb bidy has a broken jet tower. I found a cheap carb body for a 1981 cb900. Are the carb bodies the same just different jet sizes? Thanks in advance James

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...

Hi All, I recently purchased a 1982 CB750, I have the registration plate but the frame has been painted and sanded so many times I can't find the vin number on the headstock. What are the options for this? Can I get a V5 and MOT without the frame vin? Cheers, Steve

I have a 1980 CB750C. The air filter seems to fall down a few minutes after I put it in. Is there something that is supposed to be holding it up? I feel like something is missing on my airbox that holds the filter up.

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...

So just like the title says my dads 1982 is having some issues crop up. I will try and give as much details as I can from the story that was told to me. Went out for a ride and about 3 minutes into it he headed up a hill gave it full throttle to help get up the hill and he got nothing more...

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.

Guys, I'm looking for vacuum fittings I can use to connect gauges to my bike to synchronize the carbs. I have a 1980 CB750C and I just rebuilt the carbs. I'd like to hook up some gauges but I don't know how to connect them to the ports in the head. The screw has a 5mm x .8 thread and I haven't...

So I disassembled carbs on 82 CB750 that idled only on choke and killed with throttle. I'm sure I did not do the process justice. They looked pretty clean. Removed all the jets ... they all looked clean. Stuffed the wire brushed through each including the pilot jets, at least the various...

Hi all, I’ve just rebuilt the carbs on the bike I’m putting together and just wanted to know where the tube that comes off the plastic T piece between #2 and #3 is supposed to go please.

Hey everyone. I have a 1980 CB750F Super Sport project. While rebuilding the carbs I noticed in carb #1 (left side) the accelerator pump nozzle was damaged by the previous owner. No gas nor cleaner will get through and it looks like somebody tried to remove it at one time, only to damage it...

Hey guys, I have an '82 Cb750 I'm building and the carbs need love. I was referred by Sean Grier here who says he no longer sells the hardware/software kits. Does anyone sell anything comparable? My fuel intake is also jiggling and I will probably need an o ring set for that as well or its gonna...

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

I'm trying to get my CB 750 K RC01 1982 to run. There's always new problems when one is solved. I think this sound fits what I have on my bike. What do I need to do to fix this and what is needed? Also the clutch doesn't work. Can change gears when engine is off but when it's on the clutch...

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?