The Straightline Performance Polaris RMK, SKS, and Assault 850 Mountain Clutch Kit was developed specifically for riders operating above 6,000 feet elevation and utilizing the factory Polaris single pipe exhaust system.
Mountain riding places unique demands on clutch calibration. As elevation increases, engine performance characteristics change, requiring a clutch system capable of maintaining proper RPM and efficiently transferring power to the snow. Through extensive mountain testing, Straightline Performance has developed a complete clutch package engineered specifically for high-elevation operation on the Polaris 850 platform.
At the core of the system is Straightline Performance’s proven fully adjustable weight kit. Designed to provide precise RPM control and extensive tuning flexibility, the adjustable weights allow riders to fine-tune clutch calibration for changing snow conditions, elevations, and riding preferences. This flexibility helps maintain peak engine performance while improving acceleration and overall responsiveness.
The kit also includes a custom-designed mountain helix developed specifically for the Polaris 850 running the factory single pipe exhaust system. The helix profile optimizes shift characteristics, improves power transfer, and provides aggressive backshift response when riding technical terrain and deep snow conditions.
Two custom-calibrated clutch springs complete the package. Carefully matched to the adjustable weight system and helix, these springs help maintain proper engagement characteristics, improve clutch consistency, and keep the engine operating in its ideal power range.
Whether you’re sidehilling steep terrain, climbing technical features, carving fresh powder, or navigating remote backcountry areas, this clutch kit helps your Polaris 850 deliver maximum performance where it matters most.
Unlike generic clutch calibrations, every component in this package has been developed and tested specifically for factory exhaust Polaris 850 mountain sleds operating above 6,000 feet elevation.
The result is stronger acceleration, sharper throttle response, improved backshift, and enhanced deep snow control for serious mountain riders.
FEATURES & BENEFITS
- Designed for Polaris RMK, SKS, and Assault 850 models
- Specifically calibrated for factory Polaris single pipe exhaust systems
- Optimized for elevations above 6,000 feet
- Includes Straightline Performance fully adjustable weight kit
- Custom-designed mountain helix
- Includes two performance-calibrated clutch springs
- Improved acceleration and throttle response
- Faster and more responsive backshift
- Better power transfer and clutch efficiency
- Maintains optimal RPM at high elevations
- Enhanced deep snow performance and maneuverability
- Adjustable weight system for changing conditions
- Improved belt performance and drivability
- Extensive mountain testing and development
- Engineered and tested by Straightline Performance
IMPORTANT FITMENT NOTE
This clutch kit is designed specifically for Polaris RMK, SKS, and Assault 850 models equipped with the OEM Polaris factory single pipe exhaust system.
This calibration is intended for stock exhaust applications and is not recommended for aftermarket exhaust systems without appropriate recalibration.
