39mm Cylinder Rebuild Kit for GY6 49cc 50cc 4-Stroke Scooter ATV Moped Engine

Product Overview

Restore your engine’s peak performance with the GOOFIT 39mm Cylinder Rebuild Kit. Specifically engineered for GY6 49cc and 50cc 4-stroke engines, this complete kit offers a precision-bore cylinder for improved compression and fuel efficiency. Whether you're repairing a worn-out motor or performing routine maintenance, this kit ensures a stable, powerful, and smooth ride.

Product Compatibility

This kit is a direct replacement for the standard 139QMB / 139QMA engine series found in most Chinese scooters.

Vehicle Category	Common Engine Models	Brand Compatibility
Scooters / Moped	GY6 49cc 50cc 4-Stroke	TaoTao, Peace Sports, Ice Bear, Wolf
ATVs / Quads	50cc Kids ATVs	Coolster, Kazuma, Redcat, Roketa
Other Vehicles	50cc Go-Karts, Pony Bikes	Kandi, Carter, Hammerhead

Specifications

Attribute	Details
Cylinder Bore	39mm
Displacement	49cc / 50cc
Engine Type	GY6 4-Stroke (139QMB/139QMA)
Material	High-Grade Aluminum Alloy & Cast Iron Liner
Includes	Cylinder Block, Piston, Rings, Wrist Pin, Clips

Key Features

• Precision Engineering: Features a 39mm precision-honed bore that ensures a perfect seal and optimal compression for 4-stroke GY6 50cc engines.
• Enhanced Heat Dissipation: Constructed from premium aluminum alloy with an optimized fin design for superior cooling, preventing engine overheating during long rides.
• Ultra-Durable & Wear-Resistant: The thickened cylinder wall and high-strength piston rings provide excellent corrosion and wear resistance, significantly extending engine life.
• Optimized Performance: Designed to restore horsepower and improve oil efficiency, giving your scooter a smoother idle and more responsive acceleration.
• Perfect OEM Replacement: Manufactured to exacting standards for a hassle-free installation, making it the ideal choice for professional mechanics and DIY enthusiasts alike.