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final update: my sync screws are acting a bit weird so i threw it all out of sync. pulled the carbs to bench sync first, and discovered that #2's adjustment screw wasn't as far out as the others. set all to 2 ¼ after some trial and error (any further in and hanging idle returns), resynced, and...

aight, choke was completely dinked. had the levers in the wrong spots. pull out clutch halfway, fires up after about half a second, holding idle steady at 1K. let it idle a few minutes and pushed the choke in and everything seems great, honestly. resynced and things are a LOT smoother. i'll...

update: choke is not working. no working choke and behaving pretty similar to your bike when not using choke certainly seems like something. i'll try to chase that today

i seem to remember the choke being weird, actually. I bought a new cable (all the cables are new...cables are cheap), but if i clamp it on the metal bit the choke isn't fully open, so i clamped it a bit higher. that was a midnight revelation, sorry i didn't mention it earlier. i'm giving my...

it's been a few months now, but i broke them all down and followed ... some PDF i found on a forum that everyone said was the keihin guide to use, and this problem was there right away...again. i've cleaned them at least once a year for the past six years and had this problem every time -- that...

got a similar result i'm afraid. I got cocky and upped the idle screw ("look, it's great now! maybe i just need to set the idle where i like it!") but you can see i had to bring it right back down after a few minutes. it seems to happen in at least two stages, you can hear it here: again...

mm! i'm hoping to get it running "ok" and then revisit the shims. even brand new ones kept coming in a little thinner than expected so i went through several rounds and got pretty frustrated, haha. was hoping to revisit in the winter since it'll be off the road anyway. tbh i was really hopeful...

luckily for me i can't keep anything straight without a spreadsheet. not that it matters much but 4.1 is cyl 4, towards the stator. 4.1 is cyl 4, towards carb 1. ex is exhaust and in is intake Position name current shim thickness current clearance EX4.2 2.31 0.09 EX4.1 2.24 0.07 EX3.2...

they look pretty sync'd to me, but i fine tuned them a bit. it's running nicely now as it's warm so i'll have to wait for another cold start (this issue seems to manifest after hours of the bike being off)

the choke actuates properly but has minimal impact on these problems. so...i think that's probably a no? lemme give her a carb sync right quick and report back. appreciate the help. us brets & bretts gotta look out for each other lol 🤝

hey all, I've had my 81 750c for about five years now, and it's always been a bit of a pain. my friends and coworkers say i need a better mechanic (true) but i'm determined to understand the mechanics and get it sorted on my own. the bike is hard to start, sometimes requiring a bit of...

count me in :)

Thanks for the advice! I'll do the cam chain adjustments this weekend and start asking around to see if I can get my hands on some vacuum gauges.

Ghost town over here, eh? No love for the DOHCs? :) I pulled everything apart again and found my problems. In reassembly, I had one carb bowl seated wrong, and my fuel line connection with my carburetors was not secure. No more leaks! So why was it running so rough? In short, because I mucked...

Hey there, Last year, I finally achieved my dream of buying a motorcycle. I picked up a 1981 CB750 in great running condition and just a little dull in some areas and had a blast. Near the end of the summer, I noticed some fuel leaking out of the second carburetor, and had some trouble...