GOOFIT
Cylinder Head Assembly for Honda GX340 GX390 11HP 13HP Engine Replacement 12200-ZF6-406
Cylinder Head Assembly for Honda GX340 GX390 11HP 13HP Engine Replacement 12200-ZF6-406
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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.
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Fitment FAQ
Will this part fit my specific model and year?
This cylinder piston kit is intended for 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. It is best matched to original part number(s) 12200-ZF6-406, 12210-ZE3-040, 12391-ZE2-000, 12251-ZE3-800. Key physical/spec details from the product data include 34mm (Mounting Hole: 53mm), 29mm (Mounting Hole: 50mm), 11HP. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 12200-ZF6-406, 12210-ZE3-040, 12391-ZE2-000, 12251-ZE3-800 before purchase. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. This is especially important for Honda GX340/GX390 models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. If your original part number does not cross-reference with 12200-ZF6-406, 12210-ZE3-040, 12391-ZE2-000, 12251-ZE3-800, treat the fitment as unconfirmed. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Confirm OEM/cross-reference number(s): 12200-ZF6-406, 12210-ZE3-040, 12391-ZE2-000, 12251-ZE3-800. Recheck listed specs such as 34mm (Mounting Hole: 53mm), 29mm (Mounting Hole: 50mm), 11HP. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.