Blue Line
Blue Line 50mm Big Bore Gasket Kit - GY6 139QMB 81cc
Description
This Blue Line Big Bore Cylinder Gasket Kit is the gasket set for 50mm-bore big bore kits on GY6 139QMB / 139QMA 50cc scooter engines. On the stock 139QMB stroke, a 50mm bore brings displacement to about 81cc. Use it to install a new kit, or to reseal an existing one after a rebuild or a blown head gasket.
This product is intended for off-road use only. This product is not intended for use on public roads or land.
Key Features
- Sized for 50mm bore: Matches 81cc big bore cylinders on the 139QMB.
- Coated head gasket: Black coated head gasket seals combustion pressure.
- Base gasket: Paper cylinder base gasket seals the cylinder to the crankcase.
- Intake gasket included: Seals the intake manifold to the head.
Technical Specifications
- Part number: 1100-1574
- Bore size: 50mm
- Displacement: 81cc (with 139QMB stroke)
- Includes: Head gasket, cylinder base gasket, intake manifold gasket
- Engine: GY6 139QMB / 139QMA 50cc 4-stroke
- Brand: Blue Line
Compatibility
| Engine | Kit Size |
|---|---|
| GY6 139QMB / 139QMA (50cc 4-stroke) | 50mm bore, 81cc big bore kits |
139QMB engines are based on Honda's GY6 design and are used by many Chinese 50cc scooter brands. Check the engine code on your engine case and confirm that your cylinder bore is 50mm before ordering. This set won't fit the stock 39mm bore or 52mm+ kits.
Installation Notes
Clean all mating surfaces thoroughly, install the gaskets dry, and torque the head nuts evenly in a cross pattern to spec.
Product Diagrams
Features
Specifications
Part Number: 1100-1574 | Bore: 50mm | Displacement: 81cc | Includes: Head gasket, base gasket, intake gasket | Engine: GY6 139QMB/139QMA 50cc | Brand: Blue Line
Model Fitments
GY6 139QMB / 139QMA 50cc 4-stroke engines with 50mm bore (81cc) big bore kits
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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.
