GY6 A-Case 63mm Big Bore +3mm Stroker Kit
ITEM# TT-16358
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Description
GY6 A-Case Big Bore Stroker Kit for 150 cc Engines
This 63mm Big Bore +3mm Stroker Kit for the GY6 A-Case is built for 150 cc engines in the QMI and QMJ families. It raises the engine's displacement to 190 cc, adding output for off-road use. Among GY6 scooter parts, it is a choice for riders who want more capability from their engine.
Included Parts
The kit contains a 63 mm big bore cylinder, an A8 high-lift camshaft, a piston, and a +3.0 mm stroker crankshaft. Working together, these pieces are intended to deliver stronger performance and better efficiency. The high-lift cam supports greater airflow, which helps combustion and power output.
Fit and Compatibility
This kit is made for the A-case layout and uses a 54 mm cylinder stud spacing with a 65 mm cylinder skirt outer diameter. Confirm that your engine matches these dimensions before fitting. The product is for off-road use only and is not intended for public roads.
Specifications
- Application: GY6 QMI/QMJ 152/157, 150 cc A-case engines
- Displacement: 190 cc
- Cylinder Bore: 63 mm
- Cylinder Stud Spacing: 54 mm
- Cylinder Skirt Outer Diameter: 65 mm
- Intake Valve: 28 mm
- Exhaust Valve: 23 mm
- Crankshaft Stroke: 60.8 mm
- Country of Origin: Taiwan
- Fits: GY6 QMI/QMJ 152/157 150 cc A-case engines (54 mm stud spacing) with 63 mm bore kit, 190 cc
Fitment
Fits:
- GY6 QMI/QMJ 152/157 150 cc A-case engines (54 mm cylinder stud spacing)
How to choose: Make sure the engine is a GY6 QMI/152/157 150 cc A-case with 54 mm cylinder stud spacing and a 65 mm cylinder skirt outer diameter.
Shop more: GY6 Scooter Parts · Chinese Scooter Parts · Scooter Big Bore & Cylinder Kits · Scooter Parts
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