big bore kit

3 replies to this topic
  • kounkel321

Posted July 21, 2007 - 09:19 PM


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

  • ender_swift

Posted July 21, 2007 - 10:18 PM


You can go here

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

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  • grayracer513

Posted July 22, 2007 - 07:16 AM


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.

  • Ga426owner

Posted July 22, 2007 - 08:37 AM


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