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Yamaha Yfz 450??????????????????

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i have a question for all the yfz 450 experts. i have an 05 yfz that had head troubles. bought an 06 head with cams and cam hold downs. i put everything together and cant get the intake cam to push the vavles down far enough for the cam to rotate. are there any differences between these two years??????

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No the only difference is the combustion chamber. Make sure you have adjusted the valve lash correctly. Is it your center intake valve??

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