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420" Seat Pressure 54# Open Pressure 195# @ Lift 0
Retainer Material Titanium Valve Lift 0
Stainless Header / Aluminum Muffler / Stainless End Cap
Larger Swing Angles up to 45 Degrees
UNI Foam Filter Service Kit
426cc Big Bore Kit - Honda TRX400EX TRX400X XR400 RZR 900 420" Seat Pressure 54# Open426 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 youd like us to do that work, just contact us. Fits: Honda TRX400EX 1999 2008 Honda TRX400X 2009 2014 Honda XR400 1996 2007
