DESCRIPTION

NEW EVP TAPP CLUTCH UPDATES (2024): The Roller Spider replaces the original button spider, reducing friction between the spider and movable sheave. Results: improved belt grip, lower belt temps, longer belt life, and smoother engagement. The patent-pending TAPP Roller Primary Clutch.

UPDATED FEATURES:

• ROLLER SPIDER DESIGN: Less friction vs. button spiders for quicker response.
• CENTER BEARING: Black nitrate coating adds hardness, prevents corrosion, and reduces friction.
• LARGER ROLLER: Increased from 2mm to 3mm for improved bearing longevity under high horsepower.
• POST: More material and new heat-treat. Prevents slipping on the shaft and allows over-torquing for high-horsepower/drag setups.
• MOVEABLE SHEAVE: Reinforced towers for greater load capacity.
• CLUTCH COVER: Billet cover with larger windows to accept additional weight without modification.

ORIGINAL FEATURES: EVP-spec TAPP clutches cover stock through EVP Paragon, Dynomite (DM) and Desert Storm (DS) turbo calibrations. Tuned for use with the OEM secondary clutch fitted with EVP internals, including Shift-Tek Helix and Spring. Kits include the full standard weight kit plus tungsten race weights (set of 8).

• DURABLE PERFORMANCE: Billet construction and high-tech materials for extended life under extreme use.
• ADJUSTABLE & VERSATILE: Two-sided ramps, external clicker adjustment, and removable roller mass allow quick tuning as power changes.
• COOLER TEMPS: Venting and multi-angle sheaves reduce belt and clutch temperatures.
• INSTANT THROTTLE RESPONSE: Centralized mass and low-inertia design deliver strong belt grip and rapid response.
• SMOOTH, QUIET OPERATION: Ramp-based arms provide reduced vibration vs. traditional flyweights.

Disclaimer: EVP offers Tech Support only for EVP-spec TAPP clutches purchased directly from EVP. Calibrated TAPP primaries may need minor changes. For tuning help, see the instructions page or contact EVP technical support. Phone: (715) 247-3862.

CALIBRATION GUIDE

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

• Ramp Profile: Pre-chosen ramps are generally appropriate. Change only with experienced tuning.
• Ramp Angle: Adjustable with Quick Shift Bolts. Higher numbers raise RPM. Always adjust in pairs across from each other to avoid imbalance.
• Roller Size: Shipped with a predetermined size. Options: standard, +1mm, +2mm. Larger rollers quicken low-end shift and lower full-shift RPM. Change in pairs.
• Weight Adjustment: Via arm set screws and washers on the roller bolt. Add weight to lower RPM; remove to raise. Adjust evenly in pairs.

INSTRUCTIONS

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

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