Polaris Tech Tip: How to Inspect Polaris Primary and Secondary Clutch Internals

Tech Tip: How to Inspect Polaris Primary and Secondary Clutch Internals

The CVT clutches on your Polaris are "tuned" systems that use centrifugal force and spring tension to shift gears. Inside the primary (drive) clutch and secondary (driven) clutch are high-precision moving parts—rollers, weights, and buttons—that are subject to extreme heat and friction. When these internal components wear out, the clutch will "stick" or shift inconsistently, often feeling like a fueling issue or a bad belt.

Step 1: Inspecting Primary Clutch Weights and Pins

The primary clutch uses three "flyweights" to squeeze the belt as engine RPM increases. These weights must swing freely on their pins.

• The Pivot Test: With the belt removed, try to wiggle the weights side-to-side. If there is excessive "slop," the bushings inside the weights or the pins themselves are worn.
• The "Groove" Check: Inspect the curved "face" of the weight where it contacts the roller. If you see a flat spot or a deep groove, the clutch will have a "hitch" in its shift curve, causing a bog in acceleration.
• The Result: If the weights are damaged, replace them with a set of Genuine Polaris OEM Shift Weights. Always replace all three as a matched set to maintain clutch balance.

Step 2: Checking for Flat-Spotted Rollers

Rollers are found in both the primary and secondary clutches. Their job is to roll smoothly along the weights or the ramp (helix). If a roller stops spinning due to dirt or heat, the metal-on-metal sliding will create a "flat spot."

• The Spin Test: Use your finger to spin each roller. They should spin freely with no "crunchy" feeling.
• Visual Flat Spots: Look for any side of the roller that is no longer perfectly round. A flat-spotted roller in the secondary clutch is the #1 cause of a UTV that "jerks" when taking off or fails to back-shift when climbing a hill.
• The Result: Replace flat-spotted rollers immediately. If ignored, they will eventually "eat" into the aluminum clutch sheaves or the helix.

Step 3: Secondary Clutch Spring and Helix Inspection

The secondary clutch controls the "torque sensing" part of the shift. It relies on a large spring and a ramp called a helix.

• Spring Fatigue: Over hundreds of heat cycles, the secondary spring can lose its tension (sack out). If your machine is hitting the rev limiter too easily or won't reach its top speed, the spring may be weak.
• The Helix Check: Inspect the ramps on the helix for scoring or heavy wear marks. This surface must be smooth for the rollers to transition power properly.

Pro Tip: The "Dry" System Rule

The most important thing to remember about Polaris CVT clutches is that they are designed to run DRY. Never apply grease, WD-40, or oil to the weights, rollers, or sheaves. Lubricants will attract belt dust, creating a "grinding paste" that will destroy your clutch internals in a single ride. Clean your clutches with compressed air and a Scotch-Brite pad—never grease!

Keep your shifting crisp and your acceleration smooth. Shop Witchdoctors.com for OEM Polaris clutch weights, rollers, springs, and complete clutch assemblies today!

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