GY6 50cc (139QMB) Performance Cylinder Head 81cc 50mm
ITEM# TT-26788
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Description
Aluminum Performance Cylinder Head for GY6 50cc Engines
This 81cc aluminum performance cylinder head is built for 50cc engines based on the 139QMB model. It suits riders who want more output from their scooter, particularly in city traffic and on hills. It is one of the GY6 50cc scooter parts that can deliver a noticeable power gain when matched with an 81cc cylinder kit.
Build and Fit Details
The head is cast from aluminum, which helps it last and manage heat well. Its 50mm stud spacing lets it bolt directly onto several QMB/QMA engine families. A 64mm rocker arm assembly is needed to run it, and that assembly is sold separately. Both the intake and exhaust ports use 6mm threads.
Specifications
- Material: Aluminum
- Stud Spacing: 50mm
- Head Height: 60mm
- Intake Port: 24mm
- Exhaust Port: 22mm
- Intake Valve: 21.5 x 64mm
- Exhaust Valve: 19 x 64mm
- Valve Stem Diameter: 5mm
- Valve Stem Length: 64mm
- Intake Threads: 6mm
- Exhaust Threads: 6mm
- Head Height w/ Intake Valves: 66.1–67.3mm
- Fits: CSC Go Max (139QMB / GY6 50cc engine, 64mm valve stems)
Compatibility
Compatible with:
- CSC Go Max
- Other GY6 50cc (139QMB) scooters
Choosing the right part: Check your stock valve stem height first. This head requires 64mm valves and a 64mm rocker arm, whereas most stock 139QMB heads use 69mm.
Placement: Refer to part #4 on the CSC Go Max cylinder head camshaft diagram.
Other option: Cylinder Head & Valve Assembly for CSC Go., GY6 50cc (139QMB) Scooters (CSC Go. 139QMB scooters, Cylinder Head & Valve Assembly).
Browse more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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