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669-18-30 CVT Drive Belt for GY6 49cc 50cc 139QMB Scooter
669-18-30 CVT Drive Belt for GY6 49cc 50cc 139QMB Scooter
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Product Overview
Replace a worn, cracked, or stretched CVT belt with this 669-18-30 drive belt, designed for compatible GY6 139QMB / 139QMA 49cc and 50cc 4-stroke scooters and mopeds.
With a 669mm circumference, 18mm width, and 30° drive-face angle, this belt is commonly used on short-case GY6 50cc CVT transmissions, especially applications with 10-inch rear wheels.
Made from flexible reinforced rubber material, it provides a practical replacement for normal scooter CVT transmission service.
Product Compatibility
| Engine / Application | Fitment Notes |
|---|---|
| GY6 139QMB | Short-case 49cc / 50cc applications |
| GY6 139QMA | Verify original belt size |
| 1P39QMB | Compatible 669-18-30 applications |
| 49cc Scooter / Moped | 4-stroke short-case models |
| 50cc Scooter / Moped | Common 10" rear-wheel applications |
| Chinese Scooter | Match original 669-18-30 belt marking |
Specifications
| Specification | Details |
| Product Type | CVT Drive Belt |
| Belt Size | 669-18-30 |
| Belt Circumference | Approx. 669 mm / 26.34 in |
| Belt Width | Approx. 18 mm / 0.71 in |
| Drive Face Angle | 30° |
| Engine Type | GY6 139QMB / 139QMA |
| Engine Cycle | 4-Stroke |
| Application | Scooter / Moped |
| Condition | New |
| Package Quantity | 1 Belt |
Key Features
- 669-18-30 CVT Size: Designed for compatible short-case GY6 scooter transmissions.
- 139QMB / 139QMA Fitment: Suitable for selected 49cc and 50cc 4-stroke engines.
- 18mm Belt Width: Matches common GY6 50cc CVT pulley applications.
- Flexible Reinforced Construction: Designed for regular scooter transmission use.
- Replacement Drive Belt: Suitable for replacing a worn, cracked, glazed, or stretched original belt.
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Preguntas frecuentes sobre compatibilidad
¿Esta pieza es compatible con mi modelo y año específicos?
This belt fits compatible GY6 139QMB / 139QMA short-case 49cc and 50cc 4-stroke scooters and mopeds.
Many compatible applications use a 10-inch rear wheel, but the safest fitment check is to compare the original belt marking and CVT dimensions.
¿Necesito que coincida el número de pieza OEM?
No specific OEM number is required.
Check whether your original belt is marked:
669-18-30
Also verify the engine code and CVT case configuration.
¿Qué modelos o situaciones no son compatibles con esta pieza?
This belt is not intended for:
Long-case GY6 transmissions
GY6 125cc / 150cc engines
Scooters requiring a different belt length or width
Applications using 729, 743, 788, or other CVT belt sizes
Vehicles with incompatible pulley dimensions
¿Qué debo verificar antes de hacer un pedido?
Confirm:
Original belt size is 669-18-30
Engine is compatible with 139QMB / 139QMA
CVT is short-case style
Belt circumference is approximately 669mm
Belt width is approximately 18mm
Drive-face angle is 30°
Product photos and belt profile match your original part