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Old 02-10-2018, 02:39 PM   #16
Cheese cutter
KTMJACK's Avatar

Join Date: Dec 2013
Location: Sunnyvale
Motorcycles: KTM 08.300 XCW 96 KTM 250 EXC 06 BMW R1200RT
Name: Jack
Originally Posted by KooLaid View Post
It's knocking at slightly above idle rpm. It goes away at idle and at higher rpms (Or I just don't notice it at higher rpm). I bought it used and was informed that it would eventually need a rebuild and included an oem piston kit and head gasket. It was time. I'm told by another shop that these yz450f tend to need a new crank also. It was desert raced regularly before I got it.
If it have a aluminum skidplate take it off and see if the noise go's away
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