DESCRIPTION

Roller Spider upgrade reduces friction in the movable sheave for improved belt grip, lower belt temps, longer belt life, and smoother engagement.

• ROLLER SPIDER DESIGN: less friction vs button spiders for faster response
• CENTER BEARING: black nitrate coating for hardness, corrosion resistance, and reduced friction
• POST: more material and new heat-treat for added shaft clamp under high torque
• MOVEABLE SHEAVE: reinforced towers for higher load capacity
• CLUTCH COVER: billet cover with larger windows to accept additional weight without modification

• DURABLE PERFORMANCE: billet construction and high-tech materials extend clutch life. EVP has used TAPP clutches on race X3 and XPT vehicles. OEM primaries are reliable to about 300 hp; EVP Spec TAPP primaries cover a broad range up to the 200-500+ hp applications described by EVP.
• ADJUSTABLE & VERSATILE: two-sided ramps swap quickly. External clickers change shift pattern. Roller arms allow mass changes. Multiple springs available.
• COOLER TEMPS: venting, materials, and multi-angle sheaves lower belt and clutch temperatures.
• INSTANT THROTTLE RESPONSE: centralized mass and low inertia with curved sheaves and custom ramps for quick response and strong belt grip.
• SMOOTH, QUIET OPERATION: ramp-based arms ride smoothly with minimal vibration.

Disclaimer: EVP only offers Tech Support for EVP.MOde Spec TAPP clutches purchased directly from EVP. All EVP Calibrated Tapp Clutch primaries may require minor calibration changes. If you need tuning support, please reference our instructions page or contact our technical department.

Questions? EVP support (8:30am–5:00pm CST): (715) 247-3862.

CALIBRATION GUIDE

There are 4 main adjustable components in an EVP Spec TAPP Clutch:

• Ramp Profile: shipped with pre-selected ramps. Changing profiles affects the shift curve and should be done by an experienced tuner.
• Ramp Angle: adjusted from outside with Quick Shift Bolts. Higher settings raise RPMs. Always adjust angles in pairs across from each other to avoid imbalance.
• Roller Size: shipped with a predetermined size. Available sizes affect low- and full-shift RPMs. Change rollers in opposing pairs only.
• Weight Adjustment: set screws in arms and washers on the roller thru-bolt adjust RPM behavior. Add weight to lower RPM, remove to raise. Make changes evenly in pairs to prevent imbalance.

FITMENT

2024+ Polaris Xpedition

INSTRUCTIONS

Refer to EVP installation and tuning resources for full instructions.

Manufactured by Evolution Powersports. Official specs and resources: EvoPowersports.com.

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