wr reliability with yz timing

Just wondering if my wr engine will last shorter if I change the stock exhaust cam to the on from a yz450f and how reliability would be???

Have heard some that had blown engine on high rpm (piston meets valves)...?

as long as proper shims are used, reliability shouldn't change.

A lighter flywheel might work too instead of YZ cams.

as long as proper shims are used, reliability shouldn't change.

A lighter flywheel might work too instead of YZ cams.

What do you meen about proper shims??

Have heard some that had blown engine on high rpm (piston meets valves)...?

Sounds to me like somebody didn't get the correct timing set on the YZ cam.

reliability will remain exactly the same. and no you don't need a lighter flywheel!

What do you meen about proper shims??

as in you have to adjust the valves when you change the cam.

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