big bore kit

who makes big bores or strokers for a yz426? expensive? and does anyone have one and how big of a difference is it? thank

You can go here

I rode a 426 before and after it was converted (bored) into a 450. It was pretty fricken sweet.

I think the Luke's kit is 444cc, actually. IIRC, it compares fairly well price wise to the cost of replacing the stock cylinder and piston at full retail. It's a 5% displacement boost, so I'd expect a 5% power increase to go with it.

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