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leas450

big bore kit on a yz400

2 posts in this topic

I have a 99 yz400 that i want to put a big bore kit in. I was wanting to know if i could use an athena yz480 big bore kit and a yz450 or 426 rod to make it work. Or are the 450 and 400 cylinders that much different that that it wouldn't work. Does any body know anything about this?

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I know Athena used to make a 444 kit for the 426. I am not sure what they offered for the 400. Thought they will yield more power you will have less overrev.

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