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2015 KTM 350 SXF Valve Problems

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My 350 spit a valve shim for the right side exhaust valve and destroyed the cam. 56 hrs on this bike, I change the oil every 5 hrs, and dont spend much time on the rev limiter. Seems like low hours to have this problem, anyone else run into this??

 

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no, but we have 2 time,s a cracket upper valve spring collar so the shim sinking in it . 

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The spring collar looks ok other than a little chewed up from the shim being gone. The valve springs are within spec too. The valve relief on the piston is perfectly clean like the valve has been lightly hitting it, no damage to the piston and the valve appears to be straight, just clean of all carbon... I just dont want to buy all the parts and have the same problem again because I overlooked something...

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