UTV Primary Clutches

Aftermarket Primary Clutch Upgrades and Clutch Kits for Side by Sides

The primary clutch is what drives your CVT system. Bolted directly to the engine crankshaft, it uses centrifugal force to engage the belt as RPM climbs, working with the secondary clutch to transfer power through the transmission. A stock clutch is tuned for the factory power level and a specific tire size. When you add power, run larger tires, or change your riding style, proper clutching becomes a real factor in performance, belt life, and acceleration. An aftermarket clutch kit or primary clutch replacement gives you control over that setup.

Fueled UTV carries primary clutches and clutch kits for Polaris, Can-Am, Kawasaki, and other popular side-by-sides. Whether you need a complete rebuild with new weights, bushings, and sheave faces, or a full billet replacement designed to handle more torque and heat, the options here are sorted by machine and power level. Many kits are compatible with the stock secondary clutch, so you can upgrade the primary first and tune from there. Brands like SuperATV, Aftermarket Assassins, EVO, KWI, and EPI are all in stock and ready to ship. Browse by vehicle, check the fitment, and order with confidence.

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FAQ 

What does the primary clutch do on a UTV?

The primary clutch mounts directly to the engine crankshaft and controls how the CVT engages and shifts. As engine RPM rises, the clutch closes on the belt and begins transferring power to the secondary clutch and through the transmission.

When should I upgrade my primary clutch or get a clutch kit?

If you have added an engine tune, changed to a specific tire size that differs from stock, or are experiencing belt slippage and clutch noise, an aftermarket clutch or clutch kit is worth looking at. A stock clutch is calibrated for the factory setup, and changes to power level or load can push it beyond its design range.

Can I run an aftermarket primary clutch with my stock secondary clutch?

Many aftermarket primary clutches are designed to work with the factory secondary clutch. Check the product fitment notes to confirm compatibility before you order. Some full clutch kits include secondary components as well for a complete CVT upgrade.

What is the difference between a clutch kit and a full primary clutch replacement?

A clutch kit typically includes performance weights, springs, and sometimes a new secondary spring to tune the existing primary clutch. A full primary clutch replacement swaps out the entire assembly for a billet or heavy-duty unit designed to handle higher torque, more heat, and harder riding.

How do I remove a primary clutch on a UTV?

You will need a specific clutch puller tool that is compatible with your machine. Remove the clutch bolt, thread the puller in, and torque it down to free the clutch from the crankshaft. Using the wrong tool risks damaging the assembly, so make sure the puller is designed for your specific vehicle.

Do I need to tune my clutch after changing tire size?

Yes. Running a specific tire size that is larger or heavier than stock changes the load on the CVT system. Proper clutching for a new tire size usually means adjusting weights and sometimes replacing the primary spring to keep RPM in the right range and avoid belt damage.

Will an upgraded primary clutch improve acceleration and reduce belt wear?

A well-matched aftermarket clutch can improve acceleration by keeping the engine in a better RPM range during the shift. It can also reduce belt temps and extend belt life when the setup is dialed in correctly for your power level and terrain, whether you ride trail, dunes, or dirt.