Same-day shipping cutoff: Noon Pacific Time

Our offices will be closed on Tuesday, December 24 and Wednesday, December 25 for Christmas. We will be back on Thursday, December 26. Happy Holidays!

Big Bore Kit - 300cc, Wiseco

XT250 '13 - '25
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

For riders looking for advanced performance. Kit comes with everything you need to turn your XT250 into a rocket.

  • 81mm piston kit
  • 11:1 compression
  • Big bore sleeve
  • Top end gasket kit

  As with any engine or exhaust modification, you will need to re-tune your fuel delivery system for optimum performance.

CARB race use only
Ships in 3-5 business days
$399.95