Join Date: Sep 2008
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are u saying the piston hit the spark plug?
if thats the case then u got a WAY wrong spark plug in there
which does not make sence cause u said u were rideing it. and if it were to hit the plug it would of the first turn over.
and the valves and stuff would have been hit as well. 400ex heads have a small dome so ur plug is pretty protected.
if it still turns over fine (with no weird sounds) just buy a new plug (when u say it hit, the plug would be totaly destroyed) is it just that the spark plug gap was touching?
just go buy the correct plug and see what happens. and let me know.
i can help u on this i just need more detail. i have never heard of a piston hiting the plug. (totally impossible if everything is correct)