• 39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter - goofitmoto
  • 39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter - goofitmoto
  • 39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter - goofitmoto
  • 39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter - goofitmoto
  • 39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter - goofitmoto
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GOOFIT

39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter

39mm Piston Rings Kit for GY6 49cc 50cc 139QMB 4-Stroke Scooter

$9.99
$9.99
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Product Overview

This high-performance 39mm Piston Kit is a direct replacement for the standard 49cc/50cc GY6 139QMB engine. Designed for reliability and long-term durability, this kit includes everything needed to restore engine compression and efficiency in most Chinese-manufactured scooters and mopeds.

Product Compatibility

This kit fits the vast majority of 4-stroke scooters equipped with the GY6 50cc (139QMB) engine platform.

Vehicle Type Popular Compatible Brands & Models
Scooter / Moped TaoTao (ATM50-A1, Pony50), Jonway, Roketa, VIP Future Champion
Brands Ice Bear, Peace Sports, Wolf Brand Scooters, Bintelli, Kymco (Agility 50)
Engine Series GY6 139QMB, 1P39QMB, 139QMA
Other Many 49cc/50cc Chinese Gas Scooters & small-wheel ATVs

Specifications

Component Metric Measurement Imperial Measurement
Piston Diameter 39mm 1.53"
Wrist Pin Diameter 13mm 0.51"
Wrist Pin Length 30mm 1.18"
Engine Stroke 4-Stroke --
Fitment Type Direct Replacement --

Key Features

  • Enhanced Thermal Dissipation: Features an advanced heat-sink structure design to prevent overheating and extend engine life.
  • Corrosion-Resistant Alloy: Constructed from high-toughness, rustproof materials for superior durability under high-temperature conditions.
  • Optimized Compression: Precision-machined 39mm piston ensures a perfect cylinder seal, effectively restoring engine power and fuel efficiency.
  • Stable Performance: Engineered to meet OEM standards, providing a smooth, reliable ride with reduced mechanical vibration.
  • Complete Top-End Solution: Includes piston, rings, wrist pin, and circlips for a comprehensive and efficient repair process.
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Fitment FAQ

Will this part fit my specific model and year?

This cylinder piston kit is intended for This kit fits the vast majority of 4-stroke scooters equipped with the GY6 50cc (139QMB) engine platform.; Vehicle Type; Popular Compatible Brands & Models; Scooter / Moped; TaoTao (ATM50-A1, Pony50), Jonway, Roketa, VIP Future Champion; Brands; Ice Bear, Peace Sports, Wolf Brand Scooters, Bintelli, Kymco (Agility 50). Key physical/spec details from the product data include Piston Diameter: 39mm, Wrist Pin Diameter: 13mm, Wrist Pin Length: 30mm. 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/Roketa/TaoTao GY6/ATM50 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 Piston Diameter: 39mm, Wrist Pin Diameter: 13mm, Wrist Pin Length: 30mm. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.