366 Big Bore Kit
+2mm big bore kit, includes JE Pistons complete piston kit and a Cometic top-end gasket kit. This kit is a nice ‘wake-up’ call for your 350 Warrior or 350 Raptor. Available in 2 different compression ratios, 10.5:1 or 12:1.
NOTE: This kit requires your stock cylinder to be bored and honed – if you’d like us to do that work, just contact us.
Fits: 1987-04 YFM 350 Warrior/ 2005-13 Raptor / 2007-14 Grizzly