This Straightline Performance clutch kit is engineered specifically for the Polaris 550 Fan and EVO trail sleds, delivering a dyno-tested baseline setup that works right out of the box. The included weight tuning kit with custom thickness washers lets you dial in the primary and secondary springs for precise calibration without guesswork.

Riders get stronger acceleration, quicker backshifting, and a broader usable RPM range for aggressive trail riding. The complete system ships with adjustable washers, a custom primary spring, and a secondary spring, so the whole upgrade is ready to install.