MisterCB750SCMoto
CB750 Member
So I’m a first time bike owner. I found a ‘83 CB750 on marketplace, got it for $325. Reason being so low, the guy got a new bike(Harley) & he had originally lost the keys back in 2020. I got it in the beginning of March, so she sat for a good while. I got new keys made, did an oil change, changed the spark plugs, emptied out old stale gas & cleaned gas tank. Once all of that was completed, she started right up & I was able to ride her. Got up to 60 mph in 4th gear. But she would idle a little rough & didn’t ride the best. So me being me, wanting to save money & wanting to learn to do shit myself, I cleaned & rebuilt the carbs. It’s 4 into 4 & they are the keihin VB42 carburetors. I followed everything step by step & am pretty sure I did everything correctly. I got her all out back together & back onto the bike & she wouldn’t start. I came onto this side & read some posts & learned I need to manually put fuel into the fuel bowls, did that & she started right up but was up at 4k rpms and she started to spew white smoke, not from exhaust but either carbs or engine… I shut her off and waited a couple minutes & then she didn’t want to start again. I then bypassed the vacuum valve thingy lol, saw a lot of people saying to do that n just remember to shut off petcock, which I was already used to doing. So I connect fuel hose from petcock straight to the little pipe that connects 1 & 2 carbs. I then capped off the two vacuum points, the one on carb 2 and the middle plastic nipple between 2 & 3. Turned petcock to on position, waited a couple minutes and tried to start her again but to no avail. Please, if anybody knows anything that I can do to get her started & get back to riding without having to spend a pretty penny, it would be highly appreciated!!! Thanks!
