I've done my research and I am usually REALLY good with diagnosing carb issues but this thing has me baffled. It sucked a valve and that's when I bought the bike and rebuilt it. The engine is fine, cam timing is spot on from what I can tell. The Yamaha manual shows the mark as a big line on the flywheel but apparently the '02 markings are different?
The bike starts on the first kick one day and the next I have to push it down a hill to get it to fire off. It idles fine and runs fairly well wide open but anywhere between is horrible. My first guess was clogged jet/passage way but it still runs the same. Took the carb 100% apart, checked every single passage way and cleaned every single part, found nothing.
The accelerator pump shoots a nice big stream, brand new NGK spark plug, I am lost.
I know people have issues with off-idle bog when they snap the throttle, high RPM breaking up, etc. but I can't find anyone with my same issue.
Here's a video of what it's doing.
Here's a picture of the bike for those interested in seeing something awesome.
Edited by TheSlicer, August 23, 2014 - 10:39 AM.