366 Series Big Bore Kit

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  • $275.00
  • Regular price $475.00
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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