Description
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.
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