Product Overview Restore the peak performance of your 2-stroke engine with this high-precision 40mm Piston Ring Assembly Kit. Specifically designed for the 50cc Jog (1E40QMB) and Y-Zinger platforms, this kit provides a complete top-end solution to recover lost compression and ensure smooth power delivery for scooters, dirt bikes, and go-karts. Product Compatibility This kit is widely compatible with Minarelli-style 2-stroke 50cc engines and Yamaha-clone small displacement bikes. Vehicle Type Common Compatible Brands/Models Scooter / Moped Yamaha Jog 50, Yamaha Vino 50, Adly, Aprilia (selected models) Dirt Bike Yamaha PW50 (Y-Zinger), PeeWee 50, GMX 50 Chinese Scooter 1E40QMB / 1PE40QMB Engines (TaoTao, Roketa, Jonway) Small Vehicles 50cc 2-Stroke Gas Go Karts & Pocket Bikes Specifications Component Metric Measurement Imperial Measurement Piston Diameter 40mm 1.6" Piston Height 38mm 1.5" Wrist Pin Diameter 10mm 0.39" Wrist Pin Length 33mm 1.3" Engine Type 2-Stroke -- Key Features Premium Aluminum Alloy: Constructed from high-grade aluminum for excellent thermal conductivity and resistance to high-temperature deformation. Optimized Scavenging Design: Specifically engineered for 2-stroke port timing to maximize airflow and fuel efficiency. Precision-Fit Rings: High-toughness piston rings ensure a superior cylinder seal and minimize friction for long-lasting engine life. Direct OEM Replacement: Manufactured to exact factory specifications for a seamless "drop-in" installation without modifications. Complete Rebuild Package: Includes the 40mm piston, wrist pin, compression rings, and circlips—everything needed for a top-end overhaul.
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