Malossi Torque Spring Yamaha Zuma Dr. Pulley This Big Bore for the

This Big Bore for the 1997-2001 Yamaha Zuma 50 2-Stroke will require a few modifications for a better running vehicle

Yamaha Aerox 50cc

Be sure to correctly read these injectors as they are labeled with engine displacement size but rather determined by flow rate

and PHBL carburetors

Malossi Torque Spring Yamaha Zuma Dr. Pulley This Big Bore for theA variable speed drive adjuster spring from Malossi. Made from silicon steel with high carbon content, it has been heat treated, dynamically balanced, and kiln painted. Tuning the Contra Spring or sometimes referred to as a Torque Spring is very important in a modified two stroke engine. The Torque Spring controls how the variator belt changes gear ratios. Applications Minarelli type engines Yamaha Zuma 50 Aprilia SR50 Malaguti F12 Phantom LC Honda