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Quick Summary Snowmobile drag clutching is the process of tuning a continuously variable transmission, balancing primary weights, springs, helix angle and belt condition to maximize launch and top speed. The right setup depends on track length, surface and snow conditions, so change one variable at a time and log every run. The primary clutch engages the belt as RPM rises, using flyweights pushed outward by centrifugal force. The helix controls clamping force: a steeper helix favors top speed, …