DESCRIPTION
The EVP‑calibrated STM Tuner Maxxx Secondary is designed for 2022+ Polaris RZR Pro R running naturally aspirated tunes or EVP P54‑330, P54‑400, and P54‑500 levels to help avoid OEM clutch failure.
- Larger rollers and helix for more contact area, reducing pressure and wear.
- All‑billet, finned secondary improves airflow to lower belt and clutch temperatures.
- Improved belt grip and STM's triple roller layout for smoother, faster up/back shifts and better engine braking.
- Ships fully assembled. Includes secondary spring, helix calibrated to EVP tunes, and installation hardware. Additional spring rates and helix angles available from STM: (855) 387-8863.
- For best results use with EVP‑spec TAPP Primary Clutch calibrations: AVAILABLE HERE.
FITMENT
2022+ Polaris RZR Turbo R Models
STM WARRANTY
Seller warrants products for 90 days from original purchase to conform to written specifications during normal use. Seller's sole remedies are repair, replacement, or refund. Buyer must notify Seller in writing within the 90‑day Warranty Period.
Buyer pays shipping to Seller for inspection; Seller pays return shipping if claim is approved. A $75.00 inspection fee applies.
Warranty is reduced or void if any of the following apply:
- Product not maintained per Seller/manufacturer specs.
- Failure from improper handling, storage, installation, maintenance, removal, modification, or repair.
- Non‑conformity from casualty, abuse, or improper use.
- Product altered other than by Seller or without Seller's written approval.
- Product used, installed, or configured other than contemplated under the Supply Agreement.
- Product used with third‑party goods/software not designated by Seller.
- Failures resulting from Buyer‑supplied designs or specifications. Electrical components, normal wear, misuse, improper application/installation/alteration are not warranted.
Primary and secondary clutches with defects in material or manufacturing will be replaced at no charge within 90 days of purchase. Racing applications are excluded. Warranty claims require return in original packaging. Seller will determine cause of failure and premature wear at its sole discretion. Buyer is responsible for removal, reinstallation, pickup/delivery costs, and shipping alleged failed components to Seller for inspection. Retail customers must provide proof of purchase within 90 days for warranty to be honored.
ALL RETURNS FOR WARRANTY MUST BE PRE-APPROVED WITH AN RETURN AUTHORIZATION NUMBER DISPLAYED ON THE BOX. PRODUCT MUST BE RECEIVED WITHIN 10 DAYS OF DATE RETURN AUTHORIZATION IS ISSUED.
Manufactured by Evolution Powersports. Official specs and resources: EvoPowersports.com.
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