Eric Gorr offers Wiseco high compression pistons in the stock bore size and a 3mm oversize kit that makes it a 480. The 480 kit sells for $375 with boring, NICOM plating, complete piston and gasket kits. This kit makes the CRF AMA Open Class legal for 2004. He is offering a special deal at the moment, buy this big bore CRF kit and get the basic CYLINDER HEAD TUNE-UP for only $25.
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