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Paewraul

Clarity for checking valves

4 posts in this topic

I have an 01 426 that is YZ timed, and I think I'm gonna try checking/adjusting the valves myself.

From what I've read here it seems like I have to put the timing back to WR to check the valves because the references for TDC are different?

Also, if I choose to install an auto-decomp cam, do I lose the ability to run the YZ timing?

Thanks!

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TDC is TDC, regardless of where the cams are timed. TDC is taken off the crank shaft. I put my engine at TDC before the valve cover is even off anyway.

So, to answer your question, no, don't have to change cam timing.

Use a YZ450F auto-decomp cam if you want auto-decomp. The WR450F cams are timed different to the YZ450F, meaning the auto-decomp is in a different position in relation to the cam lobe.

Checking valve clearances is easy, just follow your manual.

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