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49cc/4 stroke and 150cc/4 stroke
Transmission Step-Up Kit (faster off-the-line response): Perhaps one of the most common complaints people have with motor scooters (particularly 4 stroke motor scooters) is the relatively slow take-off speed from a dead stop. This is due mostly to the gearing mechanism combined with the time it takes for a 4 stroke engine to rev-up. We have developed a transmission STEP-UP kit specifically for the 139QMB 4 stroke/49cc Engine (and clones) and for the 157QMJ (gy6) Engines (and clones). The kit will dramatically improve the take-off speed from a dead stop. The kit consists of a set of custom rollers for the variator and a CD with detailed installation and tuning instructions.
ABOUT THE CUSTOM ROLLERS...
These sliding rollers perform up to 20% better than standard round weights and last up to 18% longer with 22% less performance material loss. The weights have several unique features such as their composite material being nylon for faster performance.
* Made of unique tribological material SL-9T and SL-9TS (oilless PA46)
* Low friction coefficient / Low wear / High temperature resistance
* Aluminum compatible; No abrasive fibers (glass fiber or carbon fiber)
* Fastest Roller Weights available
While it can be installed by the consumer, it is not recommended unless you are familiar with small engines and have access to an impact wrench.
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