Product Details
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Grand Rapids Scooter's 50cc QMB139 4-stroke 50mm, Big Bore cylinder head.
Please note: replaces Cylinder Heads with 64mm Valves (Short Valve Style). Goes with Part #151GRS258 or 169GRS54 for use of 64mm Valve Set Up.
Supported Models: Bintelli, Tao Tao, Peace Sports, Wolf, Schwinn, Puma, SYM, Alliance, Motorino and Kymco.
Specifications
- Intake Valve Diameter: 21.5mm
- Intake Port Diameter: 24mm
- Exhaust Valve Diameter: 18.9mm
- Exhaust Port Diameter: 22mm
- Valve Length: 64mm (compatible with 64mm Short Valve Style Heads)
- Does not come with camshaft, please see Related Items
