WH 150cc Cylinder Assy

GY6 153QMI Engine Upgrade Kit (Aluminum Cylinder & Piston Assembly)

Part Reference: 153QMI Upgrade Kit

Product Type: Engine Cylinder & Piston Kit | 125cc Performance Upgrade

Applicable Engines: QJ153QMI (Modified GY6 152QMI Based)

Complete aluminum cylinder kit including piston, rings, and pin – designed for QJ153QMI engines in Keeway and compatible 125cc scooters.

This is a complete engine upgrade kit for the QJ153QMI engine, which is a modified version of the standard GY6 152QMI. The kit includes a new aluminum cylinder, piston, piston rings, and piston pin. Designed as a direct replacement or performance upgrade, this assembly restores compression and improves engine reliability.

Kit Includes:

• Aluminum Cylinder (57.0mm bore)
• Piston (57.0mm diameter)
• Piston Rings
• Piston Pin (15mm diameter x 42.5mm length)

Engine Type	QJ153QMI (Modified GY6 152QMI)
Cylinder Material	Aluminum
Piston Diameter	57.0mm
Piston Pin Diameter	15mm
Piston Pin Length	42.5mm
Displacement	125cc (Standard)

• Aluminum Cylinder Construction: Provides superior heat dissipation and reduced weight compared to cast-iron cylinders, contributing to more consistent engine temperatures.
• Complete Kit: Includes cylinder, piston, piston rings, and pin – everything needed for a top-end overhaul.
• Precision Machined: Cylinder bore is finished to exacting tolerances for proper ring seal and long life.
• Direct Fit for QJ153QMI: Designed specifically for the 153QMI engine variant, ensuring correct port alignment and deck height.
• Ideal for Restoration or Upgrade: Perfect for rebuilding worn engines or as a mild performance upgrade over standard 152QMI components.

✅ Installation Tip: Before installation, thoroughly clean the crankcase mating surface. Lubricate the piston, rings, and cylinder bore with clean engine oil. Use a quality piston ring compressor to install the piston assembly. Ensure the piston arrow (if present) points toward the exhaust port. Always use a new head gasket and base gasket. Torque cylinder head bolts to manufacturer specifications in a cross pattern.

⚠️ Important Note: This product is an aftermarket upgrade/replacement kit for the QJ153QMI engine. It is intended for use in Keeway ARN 125, F-act 125, Matrix 125, RY8 125, RX9 LEONE, and similar vehicles equipped with the 153QMI GY6-type engine. Always verify your engine model (look for "153QMI" stamping) and original part specifications before ordering. Images are for reference only; actual product may vary slightly.