• 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
  • 47mm Piston Assembly Kit for GY6 80cc 139QMB Engine - goofitmoto
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GOOFIT

47mm Piston Assembly Kit for GY6 80cc 139QMB Engine

47mm Piston Assembly Kit for GY6 80cc 139QMB Engine

$10.99
$10.99
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Product Overview

Upgrade your performance with this 47mm Piston Assembly Kit, specifically designed for GY6 80cc (Big Bore) 139QMB 4-stroke engines. This kit is a premium top-end solution that increases displacement and compression, providing a significant boost in power and torque for your scooter, ATV, or go-kart.

Product Compatibility

This kit is a dedicated replacement for GY6-style 139QMB engines that have been upgraded or factory-fitted with an 80cc big bore cylinder.

Vehicle Type Popular Compatible Brands & Models
Scooter / Moped TaoTao, Jonway, Roketa, VIP Future Champion, Ice Bear
ATV / Go Kart 80cc Chinese Quads, 4-Stroke Kids Go Karts
Engine Series GY6 139QMB, 1P39QMB (80cc/100cc Upgrades)
Fitment Note Fits GY6 80cc Models; NOT a replacement for XF-147QMF

Specifications

Component Metric Measurement Imperial Measurement
Piston Diameter 47mm $1.85"$
Wrist Pin Diameter 13mm $0.51"$
Engine Platform GY6 139QMB --
Engine Stroke 4-Stroke --
Material High-Strength Performance Alloy --

Key Features

  • High-Strength Construction: Manufactured from advanced alloys for superior wear resistance and thermal stability under heavy-duty racing conditions.
  • Low-Friction Surface: Precision-machined piston skirt with a smooth finish significantly reduces friction against cylinder walls for higher RPMs.
  • Optimal Sealing Technology: Piston rings feature an elastic tension design to ensure a perfect airtight seal and maximum engine compression.
  • Extended Engine Lifespan: Engineered to maintain structural integrity in high-heat environments, effectively protecting your engine from premature wear.
  • All-In-One Solution: Includes the 47mm piston, wrist pin, compression rings, and circlips—no additional hardware is required for installation.
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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 dedicated replacement for GY6-style 139QMB engines that have been upgraded or factory-fitted with an 80cc big bore cylinder.; Vehicle Type; Popular Compatible Brands & Models; Scooter / Moped; TaoTao, Jonway, Roketa, VIP Future Champion, Ice Bear; ATV / Go Kart; 80cc Chinese Quads, 4-Stroke Kids Go Karts. It is best matched to original part number(s) GY6-STYLE, XF-147QMF. Key physical/spec details from the product data include This kit is a dedicated replacement for GY6-style 139QMB engines that have been upgraded or factory-fitted with an 80cc big bore cylinder., Piston Diameter: 47mm, Wrist Pin Diameter: 13mm. Use the compatibility table and product photos together before ordering.

Do I need to match the OEM part number?

Yes. Match your original part number to GY6-STYLE, XF-147QMF before purchase. 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 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. If your original part number does not cross-reference with GY6-STYLE, XF-147QMF, treat the fitment as unconfirmed. 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. Confirm OEM/cross-reference number(s): GY6-STYLE, XF-147QMF. Recheck listed specs such as This kit is a dedicated replacement for GY6-style 139QMB engines that have been upgraded or factory-fitted with an 80cc big bore cylinder., Piston Diameter: 47mm, Wrist Pin Diameter: 13mm. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.