Blue Line Brake Sight Lens Replacement 18mm | GY6 139QMB
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Keep your brake fluid level visible and your system sealed with the Blue Line Brake Master Cylinder Sight Lens. This OEM-equivalent replacement lens fits the stock brake master cylinder on 139QMB and GY6-based scooters, and includes an o-ring gasket for a leak-free seal.
Key Features
- OEM Equivalent: Direct-fit replacement for stock brake master cylinders on QMB and GY6 engines.
- Includes O-Ring Gasket: Everything needed for a complete, leak-free installation.
- Wide Compatibility: Fits 50cc through 169cc engines with QM or FM engine codes.
- Affordable Maintenance: Restore brake fluid visibility without replacing the entire master cylinder.
Technical Specifications
- Lens Outer Diameter: 18mm
- Includes: Sight lens + o-ring gasket
- SKU: 1000-1378
Engine Compatibility
139QMB-based 50cc / 80cc engines:
| 139QMA | 139QMB | 1P39QMB | 1P39QMA-2 |
| YN139QMB | JJ1P39QMB | 139FMA-2 | BD1P39QMB |
| BN139QMB | 147QMD | Other QMA models | Other QMB models |
157QMJ-based 125cc / 150cc / 169cc engines:
| 157QMJ | 161QMK | 152QMI | 1P61QMK |
| YN1P57QMJ | 1P52FMI | 154FMI | JJ157QMJ |
| 1P57QMJ | BN157QMJ | BN161QMK-A | Other QMJ, QMK, QMI models |
Tip: Don't see your engine listed? If your engine code includes "QM" or "FM", this lens is compatible with your vehicle.
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