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motowidower

auto decomp for wr 400

2 posts in this topic

Does anyone know if the '03 Yz250F cam will work in the WR 400/426? Is the cam sprocket the same size, I have heard that Yamaha did not downsize the head on the 250s. I want autodecomp, but would like to do without the accelerated wear on the cam chain and related parts. Any info would be great.

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There are several of us 400 and 426 guys who have stuffed the '03 YZ cam in our bikes. Having done so with a risk of catastrophic engine failure...

Has not happened yet, they are all running really well (Man, it is SWEET to kick our bikes like a 2-smoke) but it still is a risk. Check out the posts at the top of the page, and read up. Plenty of info to base your personal decision on.

Good luck!

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