Extreme Kit: Ideal for Extreme style riding, improving the throttle feeling.

• 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.

NOTE- 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