50mm Piston Rings Kit for GY6 50cc 100cc Big Bore Engine

Product Overview

This premium 50mm Piston Kit is the ultimate performance upgrade for GY6 139QMB engines. Specifically designed for 100cc Big Bore Cylinder assemblies, it allows riders to significantly increase displacement and torque, restoring and enhancing the power output of scooters, ATVs, and pocket bikes.

Product Compatibility

This kit is a dedicated replacement for GY6 50cc engines that have been upgraded with a 50mm bore cylinder.

Vehicle Type	Popular Compatible Brands & Models
Scooter / Moped	TaoTao, Jonway, Roketa, VIP, Wolf Brand, Ice Bear
ATV / Quad	100cc Chinese 4-Stroke Quads, Kids ATVs
Engine Series	GY6 139QMB, 1P39QMB (Large Bore Upgrade)
Pocket Bike	Various 100cc 4-Stroke Mini Bikes

Specifications

Component	Metric Measurement	Imperial Measurement
Piston Diameter	50mm	1.97"
Wrist Pin Diameter	13mm	0.51"
Engine Platform	GY6 139QMB (100cc)	--
Engine Stroke	4-Stroke	--
Material	High-Grade Heat-Resistant Alloy	--

Key Features

• Maximum Power Upgrade: Massive 50mm diameter increases engine displacement to 100cc, delivering a major boost in acceleration and top speed.
• Advanced Heat Dissipation: Engineered with a specialized structure to efficiently manage high temperatures in air-cooled engines.
• Superior Durability: Constructed from high-toughness, rustproof materials designed to withstand the stress of high-compression performance.
• Precision Seal Performance: Includes premium rings that ensure a perfect airtight seal, maximizing combustion efficiency and reducing oil consumption.
• Reliable Long-Life Service: Rigorously tested for wear resistance to provide consistent performance over long-distance rides and heavy-duty use.