Blue Line Brake Master Cylinder Sight Lens Replacement; GY6, 139QMB
Blue Line Brake Master Cylinder Sight Lens Replacement; GY6, 139QMB
$13.33
10 in stock
*Note: Free shipping to U.S. mainland (excludes AK, HI, and territories)
Orders placed by 1pm EST on weekdays ship the same day.
Product Details
Description
Blue Line Brake Sight Lens Replacement 18mm | GY6 139QMB
Key Details
- PFS SKUs 100-219-10PCS, 100-219-1PC, 100-219-20PCS
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
Replacement Part Details
Use this part when the original component is worn, damaged, missing, or no longer working correctly. Many scooter parts can look similar but use different sizes, plugs, brackets, thread patterns, or mounting styles, so careful comparison before purchase is recommended.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, GY6
- Engine Code: 139QMB
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.25 lbs |
|---|
| Condition | New |
|---|
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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