yz426ffffff

Yz426 timing

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Got a yz426 Exhaust valve is hitting the piston and when I line my flywheel timing mark up my piston is not top dead center what could be the reason for this?

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The flywheel is not indexed to the crank correctly.  Either the Woodruff key is sheared, or it was dislodged during assembly.  Remove the flywheel and correct the problem.

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