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Hey Everyone, I swapped out my wiring harness today for a new one from vintagecb750.com While doing this I noticed that there was an additional wire running from the rear brown connector all the way up to the headlight and plugged into the black that would normally power the signal buzzer (its...

Hey Everyone, Noticed a bit of an issue today. I was using a colortune system to adjust my mixture and I noticed that cylinder 2 was firing intermittently below 2000 RPM. You are able to see the spark but there is only ignition every few cycles. There wasn't any obvious signs of a vacuum leak...

Hey guys, Trying to get the bike tuned a little better, Right now from at Idle when I give a large throttle blip there is little response/ the bike almost dies. I cant be a bit more gradual and its ok. Same for once I'm at a bit higher RPM. Fuel accel pump is working. Currently only non...

Hey Everyone, I've Been working on my CB750 for a few months now and have found a pretty decent amount of help on the forums. Before the bike was barely running and wouldn't idle below 2000 rpm, Now its quite better but still a ways away from running well. I'm not a mechanic so don't be...

Hey Everyone, I just rebuilt the carbs on my 1978 K8. I had an issue with a vacuum leak before so while changing the boots I used the opportunity to buy rebuild kits for the carburetors. -replaced all the jets apart from the slow jet (as a new one wasn't included in the kit), Gaskets...

Hey everyone, I'm doing a full rebuild on my PD 42 carbs. Ive spent the last few hours scrolling the internet trying to figure out the type of tubing and size between the carb bodies to no avail. Im guessing the yellowed tube is a vacuum tube and the black is fuel line. Does anyone have a...

Hey Everyone, I have a 1978 750K I've been having trouble getting a decent idle. I can get it down to around 1600 RPM, Any lower and I will get that odd pop hiss sound and the bike will die But, when my idle is working at that low the bike will bog down and stall if I give it too much...

Hey Everyone, Just started a CB750 project and this is my first day on the forum. I have a 1978 K8 I plan on rebuilding the carbs, But after a bit of research I've noticed that finding parts for the 77-78 carbs is much harder/more expensive compared to the K0-K6 Is it feasible to put the...