416 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 400EX or XR400, and still gives you another bore in the stock
cylinder later. 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.