EVP STM Rage 4WCP Primary Clutch for Polaris RZR Pro XP and XP Turbo/S
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EVP STM Rage 4WCP Primary Clutch for Polaris RZR Pro XP and XP Turbo/S

Completely Redesigned!

At 150+ wheel horsepower, the OEM clutches become a liability and are far more prone to breakage. Adding industry leading STM clutching to your vehicle will improve your vehicle's durability and the performance gains will be astounding! 
The STM Rage 4WCP Primary clutch features a wider, thicker, more durable spider with a new composite spider roller bushings for long life and quiet operation. Utilizing a captured pin with set screws and an all-new composite cam arm bushings, it's built for maximum durability and long life in harsh environments and ease of use. We have also added a finned fixed sheave for added air flow and cooler operation.

The included HB series weights are designed for the Pro XP and XP Turbo/Turbo-S specifically. They feature a "hump back" design and offer good belt grip on the bottom end and awesome mid to top end performance, especially on higher HP machines.

This clutch can be used with the the OEM Secondary Clutch or the STM Billet Tuner Secondary Clutch, sold separately.



  • Billet Aluminum STM Clutch - Fully Assembled and calibrated based on your Vehicle Specs* (Must answer questions prior to adding to cart)
  • High Performance Spring
  • Retaining Bolt
  • Lock Washer
  • Bolt Retaining Insert
  • Clutch Puller - To remove the STM clutch from the engine
  • Weight Fastener Kit - To calibrate the cam arms
  • Compression Tool - To change the weights or spring in the clutch without removing it from the engine


*EVP DISCLAIMER: It is the customer's responsibility to ensure that the clutch is calibrated properly for their machine per the instructions provided.


This clutch uses the OEM belt specified for your machine, but you will see improved performance and belt life with EVP's Bad Ass World's Best Belts (sold separately) 




This product is exempt from the emission standards and related requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code§§ 27156 and 38391]. This product is sold only for use in connection with EPA -certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing and not used for any recreational purpose or on public highways or right of ways maintained by and open to the public. This product is sold only in connection with machines that do not fall under state and/or federal noise or emission standards/regulations. Purchasers who/that purchase this product represent and warrant that the product is purchased only in connection with EPA -certified, emission-regulations-exempt and noise-regulations-exempt competition/racing vehicles as interpreted under applicable state and/or federal law. Questions: Call Evolution Powersports at (715) 247-3862.
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