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turbogtimk4

01 wr426 with yz cams

11 posts in this topic

I have an 01 wr426 and i just got a used set of 01 yz cams for it. Is there anything i need to change or be aware of? do i need to resurfuse the cams? also, do i need new cam bearings? what kind of power difference am i going to notice... is there less bottom end and more top? one last thing, will i need to re-jet? as you can tell, i am new to 4 stokes soyour responces are appriciated! thank you guys!!!

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Hope you didn't pay a lot for them... for 98-02, th YZ and WR cams are the same. The only difference is in the timing. Search this thread and you will find about 10 pages of posts discussing how to do it, the advantages and disadvantages of setting up your WR cams to YZ timing specs. When the cams got autodecomp, they became different, as the autodecomp is influenced by cam timing. If you just retimed the exhaust cam, the auto decomp won't be timed right and won't work. The 03 YZ cam is really the hot ticket, as you get YZ timing AND autodecomp.

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^^^ What he said...... yz and wr have the same cams that year, wr cams are just retarded...

Actually, they are advanced one tooth. The YZ cams are retarded 1 tooth wrt the WR cams.

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The yz and wr cams are different, i dont have them yet to compair, but the yamaha part number is different

I dont see why they would be.... the wr and yz motors are EXACTLY the same, no difference whatsoever (minus gearbox).

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Part numbers might be different (5BE-blah blah for the YZF and 5BF-blah blah for the WR) but that's just the model designator. The specs are the same.

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Technically I thought only the exhaust cam was advanced one tooth

That would make the YZ and WR intake cams exactly the same and the diffference in exhaust cam is that the sprocket is indexed (rotated) on the camshaft differently so the timing marks line up.

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