YX140 Cylinder Head Assembly for 1P56YMJ 1P56FMJ 140cc 150cc Pit Dirt Bike

Product Overview

Boost your engine's performance with the YX140 Cylinder Head Assembly Kit. Specifically engineered for high-performance 140cc and 150cc 4-stroke horizontal engines, this kit is a direct replacement for YX (YinXiang) power plants. Featuring optimized intake and exhaust ports, this head is designed to handle high-intensity riding while delivering maximum power output and superior cooling for your Pit Bike or ATV.

Product Compatibility

This cylinder head is a specialized fit for YX (YinXiang) Series 4-Stroke Horizontal Engines.

Engine Type	Compatible Engine Codes
YX 140cc / 150cc	1P56YMJ, 1P56FMJ, 1P56FMJ-5
Vehicle Compatibility	Pit Bikes, Dirt Bikes, ATVs, Quads, and Custom Builds
Popular Brands	SSR, Piranha, Pitster Pro, Stomp, Demon X, Apollo

Specifications

Feature	Measurement
Engine Cycle	4-Stroke
Inlet Valve Diameter	27mm (1.06")
Exhaust Valve Diameter	23mm (0.9")
Valve Stem/Pole	5mm (0.2")
Dimensions (L x W x H)	155mm x 150mm x 110mm
Material	Heat-Treated Aluminum Alloy

Key Features

• Precision Machined: Crafted from high-grade aluminum alloy with a specialized heat treatment for extreme temperature resistance.
• Enhanced Airflow: Optimized intake and exhaust passages significantly improve volumetric efficiency and power output.
• Race-Ready Durability: Sturdy structure designed to withstand high-intensity racing environments and long-term mechanical stress.
• Superior Heat Dissipation: Engineered to maintain stable operating temperatures, protecting internal components during high-load use.
• Direct Performance Upgrade: Fully compatible with 1P56YMJ series engines, providing a reliable and robust solution for engine rebuilds.