47mm GY6 50cc (139QMB) Complete Non Emissions Cylinder Head
ITEM# TT-16221
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Description
Full Cylinder Head Assembly for 47mm GY6 50cc Engines
This non-emissions cylinder head is built for the 50cc QMB139 four-stroke engine and includes the main parts needed for better performance. Its 47mm size makes it a good match for anyone planning to move up to a 72cc big bore kit. You can also browse our GY6 50cc scooter parts when you are upgrading engine output or swapping out worn components.
Specifications and Design
The head uses 64mm valves to support better airflow and combustion. Overall height is 59.5mm. The intake port measures 17mm across and the exhaust port 18mm. Intake bolt holes are spaced 44.5mm apart, and exhaust bolt holes are spaced 50mm apart.
Installation and Replacement
This head suits specific performance upgrades and modifications. Before fitting it, confirm all connections are tight and that it lines up correctly with the rest of your engine. Inspecting the head on a regular basis helps keep the engine running well and can catch problems early.
Specifications
- Size: 47mm
- Valve Length: 64mm
- Overall Height: 59.5mm
- Intake Port Diameter: 17mm
- Exhaust Port Diameter: 18mm
- Intake Bolt Hole Spacing: 44.5mm
- Exhaust Bolt Hole Spacing: 50mm
- Fits: GY6 50cc (139QMB) 4-stroke engines with 47mm bore; for use with 72cc big bore kit
Fitment
Compatible with:
- GY6 50cc QMB139 4-stroke engines (non emissions, 47mm bore)
- GY6 50cc QMB139 engines with 72cc big bore kit
How to choose: Check that your engine bore is 47mm and the model code is QMB139 before you order. If you are running a 72cc big bore setup, this is the head made for that build.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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