+8.2mm GY6 Stroker Crank

+8.2mm Stroker Crankshaft for GY6 B-Case Motors

This +8.2mm stroker crankshaft is built for B-case GY6 motors and increases displacement when used with a matching cylinder kit. Its 66mm total stroke produces 232cc when paired with a 67mm cylinder. It is one of the GY6 scooter parts that can raise engine output, a practical option for anyone wanting more from their scooter.

Performance Specifications

The crank has a 66mm stroke and a 15mm piston pin hole diameter. Main bearings are included so the unit is ready to install, and it suits performance builds. A spacer may be required to fit most cylinder kits.

Installation Requirements

Both the flywheel end and the drive end use M12x1.25 threads, each 16mm long. Correct fitting is essential for the engine to run properly, so follow all installation guidance carefully.

Specifications

• Stroke: 66mm (+8.2mm)
• 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 B-case engines (QMI/QMJ 152/157 family) with +8.2mm stroker crank, 66mm stroke

Fitment

Fits:

• GY6 QMI/QMJ 152/157 (B-case engines)

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