vertigo

I am hoping someone can help me out. Last year I purchased a Yamaha WR500 real cheap. It was a little taken apart, had to put gas tank and exhaust back in etc... It will turn over and run and you can get about 1/3 throttle out of it than it sputters and won't go any faster.
I thought it might be a carb problem so I bought another carb on ebay and it didn't make a difference. Adjusting the carb screws don't seem to have any effect either.
I bypassed the overheat sensor and that didn't do anything either. Any suggestions? I'm not running a waterbox, I have this little glass pack type exhaust that was off a Kawasaki 550, would that matter?

Thanks
Adam

JUST-IN-TIME

did you rebuild the carb?
could be timing?

check compression

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cjford717

i am having the similar problem with my pwc. I rebuilt the carb, and it made no difference. It will throttle up about 1/2 throttle and it sounds like some sort of rev limiter of some sort. I change plugs, checked compression, and checked the timing. If i fix it i will reply to you with my resolution, but for now if anyone knows what could be the problem, your suggestions are well appreciated. Thank you.