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

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.