• 57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV - goofitmoto
  • 57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV - goofitmoto
  • 57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV - goofitmoto
  • 57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV - goofitmoto
  • 57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV - goofitmoto
  • 57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV - goofitmoto
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GOOFIT

57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV

57.4mm Cylinder Rebuild Kit with Piston for 4-Stroke GY6 150cc 157QMJ Engine Scooter ATV

$89.99
$89.99
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Product Overview

Restore the core power of your scooter with the GOOFIT 57.4mm Cylinder Rebuild Kit. Specifically engineered for the ubiquitous 4-stroke GY6 150cc (157QMJ) engine, this kit serves as the heart of your motor's energy conversion. Utilizing an advanced reticulated honing process, this cylinder enhances oil retention and lubrication, significantly reducing friction and fuel consumption while maximizing heat dissipation for long-term engine health.

Product Compatibility

A standard-sized replacement for the GY6 150cc 157QMJ engine platform found in most Chinese-made street scooters and ATVs.

Brand Compatibility Engine Code Vehicle Type
TaoTao, SUNL, Buyang GY6 150cc Gas Scooters, Mopeds
JCL, Baja, Roketa 157QMJ ATVs, Quads, Go-Karts
Other Chinese Brands 4-Stroke 150cc Standard Chassis Models

Specifications

Attribute Details
Cylinder/Piston Bore 57.4mm / 2.25"
Piston Pin Diameter 15mm / 0.59"
Piston Pin Length 42mm / 1.65"
Engine Type 4-Stroke GY6 (157QMJ)
Honing Process Reticulated (Cross-Hatch)

Key Features

  • Advanced Reticulated Honing: The cylinder walls feature a specialized cross-hatch pattern that increases oil storage and lubrication, reducing wear during cold starts and high-speed operation.
  • Superior Compression & Sealing: Precision-machined 57.4mm bore ensures an airtight seal with the piston rings, maximizing the conversion of chemical energy into mechanical power.
  • Enhanced Heat Dissipation: Constructed with a high-efficiency fin structure that rapidly draws heat away from the combustion chamber, preventing power fade and thermal expansion.
  • Low-Friction Piston Assembly: Includes a perfectly matched 57.4mm piston and 15mm pin designed to move smoothly within the bore, improving fuel economy and engine responsiveness.
  • Durable Engine Rebuild Solution: Built to replace worn or scored cylinders, providing a reliable and cost-effective way to bring your Chinese scooter back to "like-new" performance.
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Fitment FAQ

Will this part fit my specific model and year?

This cylinder piston kit is intended for A standard-sized replacement for the GY6 150cc 157QMJ engine platform found in most Chinese-made street scooters and ATVs.; Brand Compatibility; Engine Code; Vehicle Type; TaoTao, SUNL, Buyang; GY6 150cc; Gas Scooters, Mopeds. Key physical/spec details from the product data include Cylinder/Piston Bore: 57.4mm / 2.25", Piston Pin Diameter: 15mm / 0.59", Piston Pin Length: 42mm / 1.65". 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/Piston Bore: 57.4mm / 2.25", Piston Pin Diameter: 15mm / 0.59", Piston Pin Length: 42mm / 1.65". If any connector, mounting point, size, or year detail is different, confirm fitment before installation.