Universal Parts
Universal Parts Valve Adjustment Screw & Nut Set - GY6 QMB
SKU 151-102
$4.00
/
Shipping calculated at checkout.
Description
Keep your GY6 or QMB139 engine running with precise valve clearance using this replacement Rocker Arm Valve Adjustment Screw and Lock Nut Set. A worn or stripped adjustment screw is a common cause of valve noise and poor idle — this direct-fit set of two restores proper valve lash adjustment quickly and affordably.
Key Features
- Set of 2 screws with lock nuts — enough for both intake and exhaust valves
- Fine M5×0.50 thread pitch for precise valve clearance adjustment
- Direct replacement for OEM rocker arm adjuster on QMB139 and GY6 engines
- Compatible with 50cc to 150cc 4-stroke single-cylinder engines
Specifications
- Quantity: Set of 2
- Screw Length: 20mm overall
- Thread Size: M5×0.50
- Application: 50cc-150cc 4-stroke QMB139 / GY6 engines
Compatibility
Fits most 50cc 4-stroke scooters and ATVs using the QMB139 engine platform, including:
| Brand | Notes |
|---|---|
| Baja | SC50 |
| Kymco | QMB139-based 50cc models |
| Panterra | 50cc scooters |
| Qingqi / Roketa / SUNL / Tank | 50cc QMB139 models |
| Various Chinese 50cc | Any QMB139 / GY6 50cc engine |
Tip: Always check valve clearance with a feeler gauge after adjustment. Intake and exhaust specs vary by engine — consult your service manual.
Product Diagrams
Features
Specifications
Quantity: Set of 2 | Screw Length: 20mm | Thread: M5x0.50 | Application: 50cc 4-stroke QMB139/GY6
Model Fitments
Fits 50cc 4-stroke QMB139/GY6 engines. Confirmed brands: Baja SC50, Kymco 50cc, Panterra 50cc, Qingqi, Roketa, SUNL, Tank, and most Chinese 50cc scooters/ATVs with QMB139 engine.
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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