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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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FAQ sur l'ajustement
Cette pièce conviendra-t-elle à mon modèle et à mon année spécifiques ?
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.
Dois-je correspondre au numéro de pièce 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.
À quels modèles ou situations cette pièce ne convient-elle pas ?
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
Que dois-je vérifier avant de commander ?
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