Polini 50mm Piston Kit (204.0929/A) is a high-performance replacement piston designed for Kymco Agility 50 and other scooters using the QMB139 4-stroke engine platform. Manufactured in Italy with precision engineering and high-grade alloys, this piston delivers improved compression, smoother operation, and long-term durability — perfect for both stock rebuilds and 80cc big bore conversions.
This kit includes the piston, piston rings, wrist pin, and circlips, providing everything needed for a professional top-end rebuild or upgrade.
Features:
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Genuine Polini Italy performance piston kit
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Designed for QMB139 4-stroke engines (GY6 50cc type)
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50mm bore – ideal for 80cc big bore cylinder kits
