For GY6 49cc 50cc 80cc 100cc High Performance Racing Clutch Bell Drum for 139QMB 139QMA 147QMD Engine Scooter Moped ATV Spare parts

Description

• Designed for GY6 49cc-100cc engines including 139QMB, 139QMA, and 147QMD models. Optimized internal groove structure enhances clutch engagement for reduced power loss and sharper acceleration.
• CNC-machined from aircraft-grade aluminum with heat treatment for stability at high RPM. Weight distribution is tuned to minimize rotational inertia, improving throttle response for performance applications.
• Strategically placed ventilation slots and airflow channels maximize heat dissipation. Maintains consistent performance under prolonged heavy use without overheating.
• Special surface treatment increases friction for tighter clutch shoe contact. Precision-cut angles ensure efficient power transfer with reduced energy loss.
• Manufactured to OEM specifications for hassle-free upgrades. Includes all necessary hardware and instructions for a straightforward installation process.
• Each assembly tested for proper torque capacity before shipping.
• Carbon Composite Provides smoother engagement, 30% longer lifespan vs. cheap cork discs, and resists oil saturation.

Black Color with Vent Port
Inner Diameter: 107mm; Overall Outer Diameter: 117.5mm
Number of Splines: 22T; Splined Inner Diameter (peak to peak): 11.1mm
Fits for GY6 49cc 50cc 139QMB Based Scooter Moped ATV Engines
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Model Number : 139QMB 139QMA 147QMD
Fit Model : for GY6 49cc 50cc 80cc 100cc
Engine Model : 139QMA 139QMB 147QMD
Engine Stroke : 4 Stroke
Material : Alloy Steel
Color : Black
Special Design : Vent Port
Customized Service : Yes

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