- 50cc OEM 39.2mm Stroke x 80mm Rod - 40mm Piston Bore
- 70cc OEM 39.2mm Stroke x 80mm Rod - 47mm Piston Bore
- 90cc OEM 42mm Stroke x 85mm Rod - 52mm Piston Bore
- 100cc OEM 45mm Stroke x 85mm Rod - 53mm Piston Bore
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