Just rebuilt the top end on a 2000 350 warrior because of a valve issue.Got it back together and now it will only idle,sounds great till you hit the throttle then it just bogs and back fires. I've set the timing a dozen times and even rebuilt the carb. I'm not an ace mechanic by any means by I can handle the basics. I set the timing marks at top dead on the fly wheel, set the cam at the mark on the head with the piston up,valves are set to specs. am I missing something or is there something I did wrong? Can anybody offer any advice.

Is it possible that you are 180* out on the crank, like you are tdc on the wrong stroke?? This is all I can think of and fairly easy to verify...

Dane

if it idles fine i would say that the cam is in time. sounds like a fuel problem with the carb. What does it do if you slowly roll the throttle on?

sounds like a cloged main jet.

I just went through this on a 2001 Yamaha 350 Wolverine. Check the emergency brake switch on the handlebars. When engaged it limits the engine rpm to 2800 - above that and it bogs and spits.

I spent two friggin days trying to find it with a service manual - found the answer in the owners operation manual. I disabled that little feature !!!