NCY Secondary Sliding Sheave Assembly; Dio, Elite, Buddy 50

This NCY adjustable Secondary Sliding Sheave Assembly is compatible with Genuine, Honda, SYM and 139QMB GY6 50cc engines. The assembly comes with two sets of ramp angles, one steeper than the other, which allow you to adjust how quickly the pulley engages. A quicker engagement means more power off the line, and more gradual engagement gives you more power at speed. Specifications: Rear Pulley Plate OD: 118.5mm, Shaft ID: 17.43<21mm, OD: 34<45.1mm, H: 68.73mm Secondary Slider Plate OD: 118.5mm, Funnel ID: 33.5mm, OD: 43mm / H: 32.70mm Secondary Spring Seat/Funnel ID: 43mm, OD: 45<61mm, H: 30mm 3x Secondary Slider Pins OD: 5<6mm, H: 9.5mm Stainless Steel Clutch Nut: M28 2x Rubber O-rings (pre-installed) Compatibility: This product is compatible with the models noted below as well as 139QMB GY6 engines with the engine codes noted below. Genuine Buddy 50 Genuine RoughHouse 50 Honda Dio 50 Honda Elite 50 SYM DD 50  139QMB-based 50cc / 80cc engines with the following engine codes: 139QMA 139QMB 1P39QMB 1P39QMA-2 YN139QMB JJ1P39QMB 139FMA-2 BD1P39QMB BN139QMB 147QMD Other QMA models Other QMB models Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle. About NCY: NCY is the aftermarket performance parts leader for most popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, and GY6 / QMB powered scooters. Made in Taiwan with strict quality standards since 1997, NCY is ISO 9001 certified. Made in Taiwan. This product is intended for off-road use only. This product is not intended for use on public roads or land. This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing. *Performance upgrades are considered racing parts and are not covered by warranty.