+3.0mm GY6 Stroker Crank

+3.0mm Stroker Crankshaft for GY6 Motors

This +3.0mm stroker crankshaft is built for GY6 motors and provides a total stroke of 60.8mm. It works with both A-Case and B-Case crankcase layouts, so it suits a range of builds aimed at better engine output. As one of the GY6 scooter parts that can increase displacement when matched with big bore cylinder kits, it is a practical pick for riders wanting to get more from their scooter.

Power and Capacity

Paired with different big bore cylinder kits, this stroker crank can noticeably raise engine capacity. As an example, a 58.5mm cylinder gives roughly 163cc, and a 67mm cylinder can reach about 214cc. The added capacity can translate into quicker acceleration and more output, which makes it a sensible upgrade for those who enjoy performance work.

Build Specifications

The crankshaft measures 285mm end to end and uses an M12x1.25 flywheel thread, giving a firm mounting point. Main bearings are included to support smooth rotation. The piston pin bore has an inner diameter of 15mm and the crank carries 19 splines, so it lines up reliably within the engine assembly.

Specifications

• Overall Length: 285mm
• Flywheel Thread Size: M12x1.25
• Flywheel Thread Length: 16mm
• Drive End Thread Size: M12x1.25
• Drive End Thread Length: 16mm
• Inner Diameter (Piston Pin Hole): 15mm
• Number of Splines: 19
• Fits: GY6 engines with A-Case or B-Case crankcases (stroker crank, +3.0mm)

Compatibility

Compatible with:

• GY6 engines (A-Case or B-Case)
• GY6 QMI/QMJ 152/157 engines

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