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The crankshaft makes it possible to use the large-displacement R/T cylinders and also provides a bargain alternative to Malossi’s BigBore crankshafts
basic weight marked on one sideDriven split pulley contrast spring made of pre-hardened steel-chrome-silicon
Fits Stock 50/70 12x16x16
If you are unsure if they will work in your machine
This also is a bit of balancing act because too much belt tension translates to inefficiency
Torque Spring 2Fast Red 34K (70-86cc) For 2Fast Rear Pulley Only TRX 450R The crankshaft makes it possibleHigh Load Torque spring made in Italy by 2Fast. This torque spring is made to reach the maximum performance of your 2Fast cylinder kit. Warning! Spring Diameter ; 58mm. Only fits Piaggio or 2Fast rear pulley.