Starter Drive Bendix Unit 50cc Scooter Moped GY6 139QMB 4-Stroke 14/65 Teeth
Starter Drive Bendix Unit 50cc Scooter Moped GY6 139QMB 4-Stroke 14/65 Teeth
SKU:SMU5006
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Starter Drive Unit (Bendix) - 50cc Scooter
Premium Quality Aftermarket Replacement
Is your scooter making a grinding noise or failing to engage when you hit the start button? This replacement Starter Drive Bendix is the essential link between your starter motor and the engine's flywheel. Specifically engineered for the 50cc 4-stroke GY6 engine platform, this unit ensures smooth, reliable power transfer for effortless starting in all weather conditions.
Key Features
- ✔ Direct Fit: OEM-spec dimensions for easy installation.
- ✔ High Durability: Anti-corrosion coating on internal spring.
- ✔ Standard Tooth Count: 14/65 configuration (Common UK/EU spec).
Technical Specs
| Teeth (Small Gear) | 14 |
| Teeth (Large Gear) | 65 |
| Total Length | 70.5mm |
| Shaft Diameter | 8mm |
| Outer Gear Dia. | 39.8mm |
Compatibility / Fitment Guide
| Engine / Brand | Typical Models | Engine Code |
|---|---|---|
| GY6 Chinese 4-Stroke | Lexmoto Echo, Enigma, Pulse Scout, Baotian BT49QT | 139QMB / 1P39QMB |
| Kymco / SYM | Agility 50, Orbit 50, Fiddle 50 | Various 50cc 4T |
| Direct Bikes | 50cc Sports, Ninja, Retro | 139QMB |
OEM Cross Reference
| Kymco: 28120-GGE-900 | Honda: 31209-GW2-004 |
| Wilson: 61-38-22000 | PIC: 6191-2967 |
Questions & Answers
Is this a genuine original part?
This is a premium quality 4Drive aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking your existing unit for the 14/65 tooth count. This is the standard bendix for nearly all 50cc GY6 4-stroke engines used in Chinese imports.
Will this fix a starter that just "whines" without turning the engine?
Yes. If your motor is spinning but not engaging the flywheel, it is usually because the Bendix gear is stuck or the internal spring has failed to push the gear forward.
Note: Please verify your engine type (GY6 50cc) and gear tooth count (14/65) against the technical specs above before purchasing. Distributed by 4drive.co.uk.
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