426 Big Bore Kit


Fits: 400EX 99-08, XR400 96-07

Part Number: bbk-426
big bore kit

SKU: bbk_400ex426 Categories: ,


426 Big Bore Kit

+3mm big bore kit, includes JE Pistons complete piston kit and a
Cometic top-end gasket kit. This kit for your 400EX 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.

Additional information

Weight 3 lbs
Dimensions 10 x 10 x 10 in