• 47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine - goofitmoto
  • 47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine - goofitmoto
  • 47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine - goofitmoto
  • 47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine - goofitmoto
  • 47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine - goofitmoto
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GOOFIT

47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine

47mm Cylinder Piston Kit (13mm Pin) for 4-Stroke 70cc CRF70 TRX70 ATC70 139QMB Engine

$56.99
$56.99
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Product Overview

Restore the compression and smooth operation of your 70cc engine with the GOOFIT 47mm Cylinder Piston Rebuild Kit. Specifically engineered for the legendary 70cc horizontal engine platform (CRF70, TRX70, CT70) and 139QMB variants, this complete top-end kit provides everything you need for a total overhaul. Crafted from premium heat-resistant materials, it ensures long-lasting reliability for your ATV, scooter, or dirt bike.

Product Compatibility

This kit is a standard replacement for 4-stroke 70cc horizontal engines with a 13mm piston pin.

Vehicle Model Engine Type Compatible Brands
Honda Classics ATC70, CRF70, CT70, TRX70, XR70 Genuine Honda & Clones
Chinese ATVs 70cc Youth Quads TaoTao, Buyang, Coolster
Scooters/Mopeds 70cc 139QMB 4-Stroke Most Chinese Gas Scooters
Go Karts 70cc Off-road Karts Standard Horizontal Layout

Specifications

Attribute Details
Cylinder Inner Diameter 47mm / 1.85"
Piston Pin Outer Diameter 13mm / 0.51" (Critical Size)
Cylinder Hole Spacing 50mm & 45mm (1.96" & 1.77")
Engine Type 4-Stroke Horizontal
Included Components Cylinder, Piston, Rings, 13mm Pin, Clips, Gaskets, Valve Seals

Key Features

  • Comprehensive Top-End Solution: Includes all essential components—cylinder, piston, rings, and even valve seals—to ensure a leak-proof and high-compression engine rebuild.
  • 13mm Precision Piston Pin: Specifically sized at 13mm to match the heavy-duty demands of 70cc horizontal powerplants, reducing vibrations and mechanical wear.
  • Premium Thermal Resistance: Constructed from high-grade alloys designed to withstand extreme pressure and temperatures, extending the service life of your engine.
  • Optimized Oil Retention: The cylinder walls and piston rings are engineered for superior oil film retention, preventing friction-related damage and improving fuel efficiency.
  • Standard Bolt-on Fitment: Features precise 50mm and 45mm hole spacing, making it a direct replacement for most Chinese 70cc engines without any modifications required.
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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 standard replacement for 4-stroke 70cc horizontal engines with a 13mm piston pin .; Vehicle Model; Engine Type; Compatible Brands; Honda Classics; ATC70, CRF70, CT70, TRX70, XR70; Genuine Honda & Clones. Key physical/spec details from the product data include This kit is a standard replacement for 4-stroke 70cc horizontal engines with a 13mm piston pin ., Cylinder Inner Diameter: 47mm / 1.85", Piston Pin Outer Diameter: 13mm / 0.51" (Critical Size). 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 Honda CRF70/TRX70/ATC70/CT70 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 This kit is a standard replacement for 4-stroke 70cc horizontal engines with a 13mm piston pin ., Cylinder Inner Diameter: 47mm / 1.85", Piston Pin Outer Diameter: 13mm / 0.51" (Critical Size). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.