Do Lighter Pulley Weights Result in Faster Acceleration?
2 Answers
Pulley weights vary from 4 grams to 12 grams, with original equipment typically around 7 grams. Lighter weights provide stronger acceleration feel at startup, while heavier weights enhance acceleration feel at higher speeds. Below is relevant information: Transmission: The weights do not affect top speed. As part of the transmission system, they don't increase power output and therefore don't improve vehicle speed. The choice depends on whether you need better performance in the initial, mid-range, or final acceleration phase - select weights according to your needs. Fuel consumption: Basically unaffected by the weights. The only possible fuel consumption impact would be choosing excessively heavy weights (making initial acceleration difficult and relatively fuel-inefficient) or excessively light weights (requiring gradual speed buildup at higher ranges, also relatively fuel-inefficient).
I've been into motorcycle modification for over a decade, and the belief that lighter variator weights give faster acceleration is a misconception. In CVT transmissions, the weights control the shifting timing - the lighter the weights, the higher the RPM needed to generate sufficient centrifugal force to move the pulley. While light weights make the engine rev up faster, they actually delay the ratio change. For example, on a stock 125cc scooter, switching to 5g light weights makes the take-off sluggish - it won't shift until 5000 RPM, and only then does mid-range acceleration become slightly sharper. For real acceleration improvement, using heavier weights to make the transmission engage earlier, combined with ignition modification, is the correct approach. Just changing to light weights actually disrupts the transmission balance.
