GY6 50cc (139QMB) Racing Clutch Kit with Adjustable Sheave Pulley
ITEM# TT-16874
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Description
Racing Clutch Kit with Adjustable Sheave Pulley for GY6 50cc Engines
This racing clutch set is built for GY6 50cc engines, with a focus on the 139QMB models. It takes the place of the stock clutch and provides fast engagement along with adjustable acceleration tuning. Among the GY6 50cc scooter parts we carry, this kit is aimed at riders who want more off-road performance from their scooter.
Performance Components
The package includes a complete clutch shoe assembly with tough, high-friction plates and springs that begin engaging at 1500rpm. The clutch bell is anodized red and has tapered vents and a splined center bore to help it run efficiently. The adjustable sheave pulley uses six grooves, so you can choose between quicker acceleration and a higher top speed.
Heat Management Design
Because this kit is meant for hard riding, the outer drive face of the clutch bell has perforated holes and angled vents. Together these help shed heat during demanding use, which supports dependable operation over time. It suits riders who regularly take their scooters to their limits.
Specifications
- Clutch Spring Tension: 1500rpm engagement
- Clutch Bell Inner Diameter: 107mm
- Clutch Bell Outer Diameter: 117mm
- Clutch Bell Splines: 22 splines, 11.2mm inner diameter (peak to peak)
- Clutch Shoe Inner Diameter: 24mm (flat to flat) / 28mm (round to round)
- Clutch Shoe Outer Diameter: 105mm
- Clutch Shoe Height: 30mm
- Sheave Outer Diameter: 118mm
- Sheave Ramp Grooves: 6 total — 3 straight (quick takeoff) + 3 curved (top speed)
- Includes: Clutch shoe assembly, vented clutch bell/drum, adjustable sheave pulley
- Origin: Taiwan
- Fits: GY6 50cc engines with 139QMB-based engine codes (139QMA, 139QMB, 1P39QMB, 147QMD and other QMA/QMB variants)
Fitment
Fits:
- GY6 50cc engines (139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD and other QMA/QMB variants)
How to choose: Look for the engine code stamped on your motor. If it matches a 139QMB-based code such as 139QMB, 1P39QMB or 147QMD, this kit is listed for it. The seller describes 'QM' or 'FM' codes as likely compatible.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Variators & Roller Weights · Scooter Clutches & Clutch Springs · Scooter Parts
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