valve clearances for the 426

hey guys my mate wants me to check his valves on his 2002 yz426f i did a search and could only find the clearances for a 2000 model cheers fella's :thumbsup:

Does he have his manual?

.10-.15mm intakes

.25-.30mm exhausts

This is for the '00 model only, with the stainless steel valves. Ti exhaust valves set .05mm tighter.

nah he doesn't have the manual thanks fella's

My manual for the '02 426 (titanium valves) says .20 - .25 for the exhaust, and .10 - .15 for the intake.

3-23.bmp
My manual for the '02 426 (titanium valves) says .20 - .25 for the exhaust, and .10 - .15 for the intake.

Same here

That's correct, but the '00 has stainless valves, and different clearances on the exhaust.

Just courious, does anybody know why they went to titanium valves in 02? Was it quicker valve action due to less weight? The longevity seems to be better with the Stainless Steel valves. Any thoughts?

they went Titanium in 2001. The theory is (i believe) that the titanum are lighter therefore less likely to have "valve float" and I suppose, they respond requicker.

I am sure someone who knows for certain will be along soon.

My 01 426 is still going with almost 400hrs on the stock valves.

My 01 426 is still going with almost 400hrs on the stock valves.

And those would be the Titanium valves.

tin fo own dat ! :thumbsup:

My 2000 WR400 has 9K miles of pretty mean AZ single track, and the motor has never been opened and the valves are always in check. I'm impressed. Hope titanium is as good as the SS valves.

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