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

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

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

$36.99
$36.99
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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.
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Fitment FAQ

Will this part fit my specific model and year?

This cylinder piston kit is intended for 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. Key physical/spec details from the product data include Cylinder Bore: 39mm, 39mm, 49cc. Use the compatibility table and product photos together before ordering.

Do I need to match the OEM part number?

Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. This is especially important for GY6/TaoTao GY6 models because similar model names can use different parts by year or trim.

What models or situations does this part not fit?

Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. Do not rely only on the model name or engine size.

What should I check before ordering?

Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Recheck listed specs such as Cylinder Bore: 39mm, 39mm, 49cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.