39mm Piston Kit Assembly for 50cc 4-Stroke Horizontal Engine

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Product Overview This premium 39mm Piston Kit is a complete top-end rebuild solution designed for 4-stroke 50cc horizontal engines. Engineered for precision and durability, it rest ores optimal compression and engine performance to your ATV, Dirt Bike, or Go Kart. Product Compatibility This kit is compatible with most Chinese-manufactured 4-stroke horizontal engines (typically found in "Monkey Bike" style layouts). Vehicle Type Common Compatible Brands/Models ATV / Quad TaoTao, Buyang, Coolsport, Kazuma, Sunl, Roketa (50cc Models) Dirt Bike Honda CRF50/XR50 Replicas, SSR, Coolster, Piranha Go Kart 50cc 4-Stroke Kids Go Karts Engine Style 50cc Horizontal Engine (Kick Start or Electric Start) Specifications Component Measurement Piston Diameter 39mm ($1.53"$) Wrist Pin Diameter 13mm ($0.51"$) Wrist Pin Length 31mm ($1.22"$) Engine Type 4-Stroke Horizontal Material High-Grade Alloy & Spring Steel Rings Key Features Precision Engineering: 39mm bore size ensures a perfect seal and restored factory compression levels. Durable Construction: Piston rings are crafted from special spring steel for superior heat resistance and longevity. Complete Rebuild Kit: Includes the piston, wrist pin, circlips, and a full ring set for a hassle-free installation. Universal Fitment: Designed to fit a wide range of Chinese 50cc ATVs, Dirt Bikes, and Pit Bikes with horizontal layouts. Reliable Performance: Manufactured to meet or exceed OEM standards for smooth engine operation and reduced vibration. Show more