426 big bore love one

got a 3 year old wr 426f; can not have another bike . need more power to have in reserve, please tell me any thing you know; i think i want one. :applause:

bore it to a 444 (2mm over), Hot Cams and some head work. It will fly. :applause:

where do i get parts ;i would love to fly.

do you know of any kits for the 98-99 YZ400f??? also looking for a little more a$$.i have the decomp. mod. soon pipe and header, but it is due for a piston and rings, would like a bigger one if possible. :applause::eek:

really don't know . i need knowledge myself

these guys make a couple of kits alsoThumper Racing

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