As the length and lug height of mountain tracks increases, the clutching requirements of the machine also change. This is especially true if you...

As the length and lug height of mountain tracks increases, the clutching requirements of the machine also change. This is especially true if you have a working combination and install a more aggressive track. The added length and height works the engine and clutches harder, as the torque feed back from the track is now greater, affecting the balance of the CVT transmission that needs to balance the torque requirements from the track to the torque output of the engine.

Longer tracks typically reduce track speeds, causing the clutches to backshift more often and be running in a lower ratio more often. If your clutching set-up includes a multi-angle helix, this can result in the clutches backshifting into the steeper, initial angle at the top of the helix, which in turn will cause the engine RPM to fall rapidly at the top of a long climb.

First, you need to be aware of how increased loads will affect the shift ratio and clutching and gearing set-up. This may require slightly lower chaincase gearing, or may require a shorter length of steep initial helix angle. Starting Line Products offers a “stepped” helix (SLP Select Shift Overdrive) for Arctic Cat models that allows the user to adjust the aggressiveness and duration of the steep initial helix angle. The helix is also cut to allow the Arctic Cat driven clutch to shift out (open) as far as the drive clutch shifts (closes). This feature alone can increase top speed by as much as 3-5 MPH! We’ve seen drive belts tear in half or flip inside out from the primary shifting further than the secondary will allow with the stock helix.

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