I have done the cam mod on my YFZ450 with no prob's except the compression stops the starter but only when motor is warm.
has anyone had any prob;s with doing this mod?broken parts?piston fail? I am thinking of putting it back to stock. i have 5 tanks of gas through on this mod.

 

Let it be know far and wide... the exhaust cam mod is not a bad/damaging mod - at least from the perspective of using a YZ cam. Refer to posts by Ridley for more information.

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