Introducing the STM Rage 4WCP Primary an all new design for the new 4 Cylinder Polaris Pro R engines. This is a stock replacement style clutch that fits under the stock clutch housing and uses the stock bolt primary and clutch puller. This primary assembly can be used with the OEM Polaris or stock replacement style drive belts.
The design is similar to the HD clutches from other machines that offer a spread cam arm pin diameter. This allows for more leverage through the cam arms and the ability to run most 5/16″pin style cam arms. This clutch also incorporates a lager diameter 2-way primary bearing design for longer lifespan through use and smooth gear selection. This primary assembly can be used with the stock or STM Tuner Secondary Clutch. Different base weight cam arms available for stock to boosted applications. With a mild tune on a 4 seat machine STM has seen top end speeds of 118+ MPH with both STM Rage 4 Primary and Tuner Secondary combo.
- WSRD Spec STM Rage 4WCP Primary
- STM Primary Clutch Spring (available in several engagement options)
- STM Base Clutch Arms (available for several different horsepower levels and engagement options)
- STM Primary Compression Tool