Polaris Clutch Weights Chart

4 wheelers and ATV's

Polaris Clutch Weights Chart

May 18, 2022

Your ATV’s continuously variable transmission (CVT) is a delicate beast. Each part is expected to work in an action-reaction chain with dozens of steps. The shift weights in your primary “drive” clutch are an excellent example of a seemingly simple component that performs a difficult task.

Why does your ride need clutch weights? What happens when you switch to a heavier or lighter weight? And how does elevation play a role in clutch tuning? Harvey’s is here with another blog to answer your critical clutch questions. 

Why Are Clutch Weights Needed?

It’s the job of your ATV’s primary “drive” clutch to spin on the engine shaft and engage the drive belt. When the clutch’s sheaves compress the belt enough, it starts the transfer of power to the secondary “driven” clutch and the rear transmission shaft. 

When the drive clutch spins, it creates centrifugal force that enacts on the shift weights mounted to its mobile sheave. These oblong rounded wedges push away and out from the center of the clutch, applying force to matching rollers mounted on the immobile “spider.” The shift weights are responsible for the actual movement of the primary clutch sheave. 

So why doesn’t Polaris just build their primary clutch with the correct weight to shift itself as it spins? Why have the weights as separate parts all their own? It all comes down to tuning.

Polaris Clutch Weights Chart

The weights in your drive clutch are key to tuning your vehicle’s peak RPM, shift speed, torque, and horsepower. Without them, also we wouldn’t be able to properly compensate for other adjustments to your ride like aftermarket springs or larger wheels

Many modern clutch weights are adjustable, using a series of holes and weighted magnets or a central mounted screw to balance the different segments. Others may use solid weights, requiring the whole weight to be swapped when tuning. Look for a clutch weight chart in your vehicle’s manual like this one from an older Polaris model. 

What Do Heavier Clutch Weights Do?

Increasing overall primary clutch weight will result in a lower peak RPM and slower sweep to reach that peak. It will also mean that your clutch will try to shift closed quicker. A stiffer primary spring may be needed to compensate for increased clutch weights.

What Do Lighter Clutch Weights Do?

Reducing your overall clutch weights will result in a faster RPM sweep to peak, and a higher peak RPM. A softer primary spring may be needed to compensate for lighter clutch weights. 

How Does Elevation Play A Role in Clutch Tuning?

Unless there’s a more than 200 RPM difference in your ATV’s performance, you most likely won’t be able to tell. While both temperature and elevation can affect your Polaris’s horsepower and RPMs, we’d say they’re probably not going to make a noticeable difference in your ride.

 If you’re using your vehicle for drag racing in unusually hot climates or at high altitudes, then yes, tuning might help boost your performance. But for most riders, the stock tuning on your clutch weights should be satisfactory. Polaris tunes their assemblies to handle a variety of use cases, terrains, climates, and elements. 

Taking The Weight Off For You

Harvey’s Polaris OEM-style Mother Clutcher primary clutches come pre-tuned and balanced. No need to worry about the ratios of clutch weights to springs, just bolt on and ride. Unlike some competitors, we care about the precision of your ride. That’s why each Mother Clutcher comes with a one-year warranty backed and fulfilled by Harvey’s ATV Parts.

Stay Tuned

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