426cc Big Bore Kit - Honda TRX400EX TRX400X XR400

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  • $325.00
  • Regular price $395.00
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426 Big Bore Kit

+3mm (88mm) big bore kit, includes JE Pistons complete piston kit and a
Cometic top-end gasket kit. This kit for your 400EX, 400X or XR400 gives a noticeable power increase without a loss in reliability. Available in 2 different compression ratios.

This kit requires your stock cylinder to be bored and honed – if you’d like us to do that work, just contact us.


Honda TRX400EX 1999-2008

Honda TRX400X  2009-2014

Honda XR400 1996-2007