SPI Variatorkit BRP Rev Gen 4 850 146-174" Friåkning

2017 Ski-doo Summit Rev Gen 4 850 E-TEC 146”-175" Performance Backcountry kit (includes adjustable P-drive weights) 0-3000ft Clutch Kit.

This kit is designed for those who want to ride their Summits at low elevation.

The complete performance clutch kit for your specific machine. Our kits are built on extensive in-field testing and then tested on our in-house chassis dyno.

A complete kit designed to drastically improve acceleration, back-shift while improving top MPH. This is a complete kit ready to bolt in your machine. For those of you who like to tune this kit includes our fully adjustable clutch weights allowing you to modify the kit for your riding style.

Kit includes: Primary spring, Secondary spring, Custom Straightline Helix, Adjustable weights and magnets for clutch weight tuning.

Includes recommended settings for both Stock & Straightline exhaust applications.