BIG BORE KITS for YZ 400 and 426

YZ459 OR 500 BIG BORE KITS. Where can one buy them and who can fit them. Are there any downsides. Max


Check out Forward Motion, he can either sell you a whole cylinder or big bore your stock cylinder. Eric Gorr does awesome work and he is very cheap. He only charges like $350 for the Big Bore and this includes the Piston / Rings / Gaskets. I havent used him for my thumper but I used him for my CR125.

He advertises on where there are many posts from members about his services. Hope this helps you out.

Good Luck!!

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