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So after a new reg/rec and another set of spark advancers and going through my carbs many times I was all but ready to give up and take it to someone. I was reading some random thread that said take off the airbox cover and see if it runs better. I thought well I might as well try it. Took...

Thank you for the reply! I actually figured it out after thinking it had to be electrical the entire time. I also didn't think it could be carbs because I had them ultrasonically cleaned and I synced them. I ended up changing the reg/rec and that wasnt it... so I tried used spark units...

1981 CB750C DOHC The bike revs fine in neutral but on the road it runs fine until you get to 5k RPM and it dies. I have to get off the throttle and then it is okay. Does this in every gear except neutral. Also once it is warm the bike overall runs terrible at all rpm (maybe because the...

Would love to get an answer to this. Sounds like your problem is similar to mine. 1981 cb750c dohc I am unable to get passed 5k rpm while in gear, it revs fine in neutral... bogs out and no power until I'm get completely off the throttle. Runs fine up to 5k rpm. I have ultrasonically cleaned...

Haven't got the carbs back on to try yet but I think I found the culprit. The Air Cut Off valve on carb #1 is wore through and the O-ring is missing. From checking other threads this ACV is to provide the cylinders with gas when you let off the throttle while driving so the bike doesnt strain...

Okay... I have the stock air box and also have the same issue. Hoping this is the forum that can help. Have spent maaany hours now trying to figure this out. Purchased the bike and started assessing the issues. -Does not idle. -#4 exaust was blowing cold - #4 carb was not sealed into boot -...