engine

Evening Friends, Ill state briefly that the current issue im having is cranking not starting. Last time it ran was about 2 months ago....Bike has been sitting with gas in carbs since then... In my mission to get this bike starting reliably and running, I've been chasing my tail. Moments...

Hello, I have been trying to remove the pin holding the kick starter's mechanism for a while now, but without any success. Have tried using pliers and using a heat gun but without any luck. I have already read that it is better to avoid touching it as it can be complicated to put the spring...

Does anyone have any good resources for information on the original exhaust for the '79-'83 CB750K? I'm specifically interested in the 1980 bike info. I'm seeing exhaust that are labeled, Sankei 2043, Sankei 2075. And it looks like HM425A is the correct fit. I don't want to accidentally buy an...

Hi all, So I purchased myself a Honda CB750K3 project bike. The engine and bike were wrecked by the previous owner. Went on eBay and purchased an "in good condition" according to the seller CB750K2 engine. Now that I'm slowly building up the bike I wanted to connect a lithium regulator. But...

Hey folks, I've got a problem. After double checking all my wiring and being 110% it's all correctly connected, I think I have worked out why my neutral switch is not triggering the neutral light. As I understand it, when the end of the switch connects to the shift drum (when placed in the...

Hi all, can anyone tell me whether a 1980 CB750KZ DOHC (UK version) RC01 engine is the same as the 750K (North American version) RC01 engine? I’m looking to potentially take parts from one to another. Thanks.

Hey guys, I currently have a 78 cb750f motor completely torn apart. I am building a cafe racer, and am looking to build a street reliable motor with some mild horsepower upgrades. Would like to keep stock carbs if at all possible. I’ve been looking at Cycle X’s .50 to 1.00 over piston kits...

Hey folks. I have just rebuilt the top end of my 1982 CB750F supersport engine which included engine removal, flipping it over to remove the oil pan and reassembly. Although I didn't rebuild the oil pump when I flipped the engine some oil came out in the vicinity of the oil pump so I fear that...

Hi all, I’m looking for advice on the best method of cleaning the inside of my exhaust port. They look pretty filthy/corroded. I’ve attached two photos for info. Any advice?

I have just bought a 1981 CB750FZ. I have just checked the Valve Clearances and they are all to tight Exhaust 004 004 003 003 003 003 004 003 Intake 003 002 002 003 004 002 004 003 Just asking where about does the high part of the Cam Lobe point to get the correct reading ??? I...

Hi All, I'm new here, and have just acquired a 1980 CB 750 Custom. Please could the wealth of knowledge on this site let me know - do the valve gaps need adjusting or are they hydraulic? Thanks.

I've looked at a few magnetic drain plugs to replace my stock drain plug (1982 Supersport). They all seem to be a good bit longer than stock. Anyone know of any limits to how long the plug can be before it gets hit by something spinning around? I don't have a clear idea of what is happening...

Need some expert advice or tips. I have an engine for a restoration project that I just opened up. The cam is shot, but I expected that. I pulled the head and found non-stock pistons. They measure 65mm, so I have an 836 motor. I pulled the cylinders and the pistons are made by ART. I learned a...

Everything electrical is new besides pulse generator and spark units I checked compression and it's good but when I try to start it gives a weird sound and occasional fire ball out of the exhaust pipe I have new carbs ,battery ect.... any advice would be greatly appreciated 🙏

First time splitting a crankcase. What caused this damage where the bearing sits? Is it repairable or will it be ok to move forward.

I noticed when I split my cases that there were a few spots that had some type of liquid gasket on only some of the surfaces to seal the 2 case halves. About ready to seal this baby up! Is it a good idea to seal up the whole case when re-assembly? Or any of it for that matter? Seems like the...

I bought a 76 cb750f out of a junkyard a while back. I realized after I bought it, that it had a k model motor in it. I then stumbled across a F model motor for cheap which appears to be out of a 78 cb750f (motor # 3156256) which I’m going to run in the bike instead. My question is what are...

Any direction appreciated or should i say lead - where to purchase an original or aftermarket exhaust

Can anyone recommend a good exhaust supplier, I need both right side pipes late 69 750 Four? Thanks

Does anyone have a good quality supplier for exhaust for a 69 750 four, I need both right side? Thanks

Hoping to get some input on an issue I’m having with my ‘81 CB750k. Running stock airbox with 4into1 exhaust. I believe it has about 20k miles on it. Seems to be missing on cylinder 2. She smokes pretty bad (blue) out of the exhaust on deceleration. Spark plug is fouled. Here’s what I’ve done...

I bought a 77 cb750k and it has a small oil leak and I’m sure it probably needs to be tore down and refreshed. Runs great, but the oil spot on the garage floor is annoying. When I got the bike I was also given a complete gasket kit only down side the label on it says it’s for a 76-78 cb750 super...

Are the 1975 and 1978 CB 750 exhaust systems interchangeable?

Hi Fellow CB people, all new this but does anyone know where I can find 2 x 2043 Hm 425 Left exhaust brackets and 1 right and 1 x 2069 Hm 425A left. As I said I'm new to this so I've probably posted this in wrong section. Any help or advise welcome.

Was wondering if anyone has an exploded view or assy view of the shift mech. for a 73 ish CB750? Below is the assy I am asking about. I have all the parts but were in a box when i purchased this bike. The manual I have is terrible as far as detailed views or explanations. Thanks!!! UPDATE...

I am doing a partial rebuild on a 1973 CB750 engine. I was wondering if anyone knows the tolerances for crankshaft to bearings. I just picked up some plastigage and cannot find the tolerances for this engine. Thanks!

What type of caliper grease should I use when rebuilding caliper? I have the heavy black brake grease by CRC

But a thread about big-bore kits and other modifications for them to work optimally. Several decades ago I did a Wiseco 836 kit conversion to one of mine. I seem to recall the kit included heavy-duty studs (or maybe not...) but the shop I bought the parts from made sure they were included. This...

can you reuse con rod bolts on a cb750 f1 1976

When do the changes made to the 69, 70, 71 72 and 73 CB750 take place.... are those early engines compatible to say 74 or 75? Does someone have a list of when changes occured... much like the Corvette's C1, C2 etc.....? Or where I might find a list like that? I think I need to be more...