Cylinder Head Assembly for Honda GX340 GX390 11HP 13HP Engine Replacement 12200-ZF6-406

Product Overview

Bring your heavy-duty equipment back to life with the GOOFIT Complete Cylinder Head Assembly. Designed specifically for Honda GX340 (11HP) and GX390 (13HP) engines, this kit is a direct OEM-spec replacement. Whether it's for a generator, pressure washer, or water pump, this fully equipped assembly—including rockers, valves, and springs—is built for industrial-grade durability and stable performance under high load.

Product Compatibility

Direct replacement for Honda and premium Chinese clone 4-stroke engines.

Engine Model	Displacement / Power	OEM Cross-Reference
Honda GX340	337cc / 11HP	12200-ZF6-406
Honda GX390	389cc / 13HP	12210-ZE3-040
Gaskets/Parts	11HP/13HP Series	12391-ZE2-000, 12251-ZE3-800

Specifications

Attribute	Technical Details & Measurements
Air Intake Port	34mm (Mounting Hole: 53mm)
Exhaust Vent Port	29mm (Mounting Hole: 50mm)
Stud Mounting Distance	77mm / 92mm
Spark Plug Model	F7TC (Included)
Assembly Status	Pre-installed (Rockers, Valves, Springs, Clips)
Material	Thickened Corrosion-Resistant Aluminum Allo

Key Features

• "Ready-to-Bolt" Convenience: This is a fully loaded cylinder head assembly. Valves, springs, and rocker arms are pre-installed, eliminating the need for complex valve spring compression tools.
• Reinforced Heavy-Duty Build: Featuring a thickened shell design, this head is engineered for superior wear resistance and can withstand the intense thermal cycles of 13HP commercial engines.
• Advanced Thermal Management: The high-grade alloy structure provides super heat dissipation, preventing warping and ensuring stable power output during extended run times.
• Optimized Fuel Economy: Precision-machined intake and exhaust ports improve airflow efficiency, resulting in stronger power and better oil-saving performance.
• Corrosion-Resistant Coating: Treated to resist rust and corrosion, making it ideal for equipment used in outdoor or high-humidity environments.