Maintenance & Technical > KX450F / KX250F

10 hour motor with a super tight exhaust valve

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DoldGuy:

--- Quote from: don46 on May 03, 2010, 02:41:00 AM ---First, yes it is probably more common to shim at an early stage rather than later, as the valves seat in they get tighter and may need to be shimmed. If you continue to ride like it is you'll need another new motor. Change the piston to an aftermarket, I like  Wiesco, the 06 had an issue with the piston breaking. Tight vavle is probably why it doesn't want to start. Remember when your selling something you can say whatever you want to, who's going to challenge you, an 06 with 10 hours, hmmmm, pretty tough to swallow. maybe 10 hours since the person put an hour meter on it.

--- End quote ---

As Don stated above, piston problems. What if it's the piston making the noise? How do you KNOW the piston has been changed? The seller said so? I am no expert on these (or anything else) but I have never seen a valve tighten up like that in just 10 hours use. Sounds like you should not assume anything until you investigate further.
Just my $.02 worth, hope everything works out.
DoldGuy

JEREMYZDEAD:
I took the guys word on the motor. You may know him as toomanykawis. Cool guy, I trust him. Well I took it apart today and the shim popped out from where it sits ontop of ths valv locks and wedged itself between the top of the retainer washer and cup. Which brought it out of spec. Put it back together an it was .10 over so I reshimmed and now it runs like it did when I first put it in. The mech here says its from over rev. I don't know. Thanks anyway.

maddoggy:
there are alot of times that i hope we are wrong when we give our opinion. i hope everything turns out this good. i would trust 99.9% of the guys on here to sell parts and not screw another member. go ride and keep those revs under 50,000. :-D

JEREMYZDEAD:
It was .07 over and I like to give the benefit of the doubt with ebay insurance. :-D

ToomanyKaws:
It was my motor. It had less than ten hours on it.  I put a Wiseco in cause with 06's so many said they had piston failures and it destroyed the engine.      Do you hold the throttle open in the air over jumps a lot?   Engine has a rev limiter but even so bouncing off it enough could float the valves and have a shim get wedged.
   

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