50cc PW50 1981–2009 Cylinder, Piston Ring, Gasket, and Top End Assembly

Key Features

• Complete Top-End Restoration: A 100% brand-new, comprehensive rebuild kit engineered to restore factory compression, reliable power delivery, and smooth operation to your youth dirt bike.

• Direct OEM Specification Match: Precision-cast cylinder and finely machined piston components ensure an exact fit with original crankcase dimensions, eliminating the need for structural modifications.

• High-Durability Metallurgy: Cylinder barrel and piston rings are engineered from high-grade alloys to minimize heat deformation, resist wear under continuous high RPMs, and extend engine service life.

Fitment Guide

Specifically engineered as a direct replacement kit for the following 2-stroke mini dirt bike models:

⚠️ Fitment Note: Please check your vehicle's exact production year before finalizing your purchase to ensure seamless alignment with your original intake and exhaust routing.

Package Includes (Comprehensive Component List)

Cylinder, Cylinder Head, Piston, Piston Rings, Wristpin, Needle Bearing, Circlips (2), Head Gasket, Base Gasket, Cylinder Studs (4), Cylinder Stud Nuts (4), Spark Plug

(Everything is bundled exactly as pictured in the factory packaging).

Important Buyer Notes

• Pre-Lubrication Required: To prevent immediate piston scoring or seizure upon the initial startup, always apply a generous coat of clean 2-stroke engine oil to the cylinder wall and piston skirt during reassembly.

• Gasket Preparation: Ensure all mating surfaces on the crankcase are thoroughly cleaned of old gasket residue to guarantee a flawless, leak-free seal.

• Professional Installation Recommended: Top-end engine assembly requires precise torque specifications and careful alignment of piston ring gaps. Professional installation by a certified powersports mechanic is highly advised.