Clutch

Primary vs. Secondary CVT Functionality & Thermal Mitigation

An efficiently tuned ATV and UTV clutch setup balances the speed-sensitive Primary clutch on the engine crankshaft with the torque-sensitive Secondary clutch on the transmission input shaft. As engine RPMs increase, flyweights inside the primary clutch swing outward, forcing the movable sheave to squeeze the drive belt and climb to a higher mechanical gear ratio. Simultaneously, the secondary clutch uses helix angles and spring rates to manage belt clamping force, shifting back down automatically when the vehicle hits high-load obstacles like steep hills or thick mud pits.

The single greatest threat to off-road transmission performance is excessive heat build-up. When a belt slips against aluminum sheaves, it raises clutch temperatures past critical levels, accelerating wear on rollers, slider buttons, and internal bushings. Our performance clutch kits feature optimized ramp configurations, custom-wound primary springs, and specialized ventilation properties. These upgrades drastically lower running temperatures, ensuring consistent engagement and preventing power-robbing belt fade during long, aggressive trail sessions.

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Coordinate corresponding transmission overhauls, high-clearance lift kits, and valvetrain modifications from our central stock:

• Chassis Clearance Modifications: Account for oversized tires and heavy rotation loads with an ATV and UTV suspension lift kit.
• High-Output Engine Tuning: Match your clutch shift points to the higher RPM limits of a fresh performance camshaft.
• Symmetrical Braking Upgrades: Manage increased rolling speeds safely with high-friction performance brake kits.
• Auxiliary Visual Signaling: Stay visible to trailing drivers during high-speed runs with an integrated LED chase light bar.
• Front Chassis Impact Armor: Protect your front frame structures on technical trails with a heavy-duty steel front bumper.

Belt Alignment, Sheave Inspection, & Retorque Safety Guidelines

When servicing a CVT system, always inspect the aluminum sheave faces for grooving, wavy wear patterns, or black belt residue—clean them thoroughly with fine scotch-brite pads and brake cleaner before reassembly. Use a dedicated clutch compression tool to service internal springs safely, preventing sudden tension releases that can damage the aluminum castings. Always use a calibrated torque wrench on the primary and secondary retaining bolts to match your vehicle's factory specifications precisely; failing to do so can cause a clutch to spin off the shaft at high speed, completely destroying the engine housing. For metric hardness ratings and technical standards regarding industrial power transmission belts, refer to the International Organization for Standardization (ISO) Directory.

Clutch FAQ