Same-day shipping cutoff: Noon Pacific Time

We will be leaving the office slightly earlier than usual this Friday 5/24 at 2pm (Pacific Time) and will be back in action on Tuesday 5/28 at 9:30am. We are taking a little break to enjoy some quality time with our families and to celebrate the Memorial Day weekend.

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Big Bore Kit - 300cc, Wiseco

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

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.

Ships in 3-5 business days
$399.95