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Topend help

1434 Views 18 Replies 4 Participants Last post by  chuckrussell
my trx200sx runs and drives some what it idles fine but when I give it gas I can hear the topend I rebuilt the motor after the valves stuck and bent I put all new valves and cam chain and tensioners in it does anyone have an idea of what could be the problem I have done everything thanks
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Sounds like a valve seat has loosened up in the head casting. Thats the only way a valve can get bent without hitting the piston. I take that back... if a guide is real bad, broken or split open, a valve can get bent. I'd yank the head and have a look at the valve guides and the valve seats before starting up that motor again.

EDIT: Replace the valve springs too. They are probably junk.
Refrain from posting adult language please. Thank you.
Check compression, it may have destroyed the piston by now. It sounds like the cam is installed a tooth advanced and the motor is running some severe detonation.
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