Prima Roller Weight Tuning Kit (15x12)

The Prima Roller Weight Tuning Kit (15x12, 2g-13g) is the best way to tune the CVT transmission in a Yamaha Jog or Zuma 50cc engine, as well as many Minarelli clone motors noted below. Specifications: Includes 3 of each roller in sizes ranging from 2g to 13g, for a total of 36 weights. Combining 2 sets of rollers allows you to tune your engine with a large variance in weight. For example, using the set of 10-gram rollers and the set of 12-gram rollers, alternating weights in variator results in an 11-gram roller set. Using the set of 10-gram rollers and the set of 11-gram rollers, alternating weights in variator, results in a 10.5-gram roller set. Lighter weights increase RPMs for a given road speed, while heavier weights lower RPMs for a given road speed. Tailor your tuning to match your engine setup and personal driving style. Compatibility: Yamaha Zuma 50 2-Stroke Yamaha Jog 50 Yamaha Vino 50 Yamaha C3 Minarelli Clone engines 1E40EQMB Engines 1E41QMB Engines 1PE40QMB Engines *DANGER: Weights must be installed in a 120-degree pattern! If not, SEVERE ENGINE DAMAGE WILL RESULT!!! Please refer to our handy chart for more info on roller weights. Visit our blog for additional tips and news. About Prima: Prima is the industry leader in premium scooter accessories, service parts and scooterist protective apparel. Prima brand products are designed direct-fit for all popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, Royal Alloy and GY6 / QMB powered scooters. Made in Taiwan.  WARNING: California’s Proposition 65