Effect of Changing Primary Fixed Sheave Angle and Roller Weight on Torque, Power, Top Speed, and Acceleration on Matic Motorcycles

This study aimed to determine the effect of angle changes on primary fixed sheave and roller mass torque, acceleration, engine power, top speed automatic motorcycles. type research is experimental research. The subjects in this were 125 cc motorcycles modified at rollers. angles change 14.5˚, 13.5˚, 12.5˚; while was 14, 13, 12 grams. testing began with tuning up motorbike, then installing units that have been CVT (Continuously Variable Transmission) drive for further testing, collecting data using a dyno test tool. results show that: 1) Changes made pulley, especially Primary weight or application simultaneously affect motorbikes; 2) changing (13.5˚) 13 grams can increase maximum (top speed) by 0.4 (Kph) compared standard ones; 3) power torque resulting from rollers applied same time do not significantly acceleration. Conversely, low necessarily reduce acceleration