Extreme Kit:

Modifies the compression for a smooth and progressive delivery of power. Improving traction and engine control especially important in technical areas.

Its design manages to lower the temperature by eliminating the typical hot spots of the original cylinder heads.

Ideal for Extreme style riding, improving the throttle feeling.

For the 250cc 2017-2021 with Carburetor,  you need a cap to cover the sensor thread. (ST-1235) available on our website, picture attached for reference.

* All kits include: cylinder head cover, insert and O-rings