Cylinder Head & Valves Top End Gasket Kit for Honda Rancher 420 TRX420 All Models 2009-2024 FA/FE/FM/TE/TM/FPA Replaces 12200-HP7-A01 12200-HP7-A00 12315-HR0-F01

Brand Name: M MATI

Origin: Mainland China

For ATV Brand/Model: Honda

Placement on Vehicle :     Engine  

MPN :      

12200-HP7-A01 12200-HP7-A00 12315-HR0-F01  

 12251-HP7-A01 12191-HP5-601

Package :  

Cylinder Head x1
Cylinder Head Valves Top End Gaskets x1
spark plug x1

Warranty : 1 year

Condition :  NEW

Fit for following Honda ATV

Rancher 420 TRX420FPA 2009-2014
Rancher 420 TRX420FPE/FPM 2009-2013
Rancher 420 TRX420FA/FE/FM/TE/TM 2009-2024

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    🛠️ Installation Tips 

• Clean the Block Face: Ensure the cylinder block surface is perfectly flat and clean. Use a plastic scraper and brake cleaner. Even a tiny piece of old gasket will cause a blown head gasket within hours.

• Valve Lapping: For maximum compression, we recommend "lapping" the new valves into the seats with grinding compound before final assembly. This ensures a 100% airtight seal.

• Torque Sequence: You MUST use a torque wrench. Tighten the cylinder head bolts in the factory-specified "star" pattern and in stages (e.g., 50% torque, then 100%). Failure to do this will warp the new head.

• New Engine Oil: After a top-end rebuild, always change the engine oil and filter. Metal shavings from the seat-cutting or assembly process must be flushed out.

• Check the Cam Chain: While the head is off, inspect the cam chain and tensioner for wear. If the chain is loose, it can skip time and destroy your new valves.

🔍 Troubleshooting Guide

Issue	Possible Cause	Solution
White Smoke from Exhaust	Blown head gasket (Coolant leak).	The Rancher 420 is liquid-cooled. If the gasket fails, coolant enters the cylinder. Replace the head and gasket immediately.
Blue Smoke / Oil Burning	Worn valve seals or valve guides.	If your Rancher smokes upon startup, the oil is leaking past the valves. This kit includes new valves and seals to stop the smoke.
Loss of Power (Low Compression)	Burnt valves or leaking head gasket.	Perform a compression test. If it's low, the valves are likely not seating correctly or the head is warped.
Tapping/Clattering Noise	Incorrect valve lash or worn rocker arms.	Ensure you adjust the valve clearance (lash) to factory specs after installing the new head.
Coolant in the Oil	Cracked head or failed head gasket.	If your oil looks like "chocolate milk," stop the engine! The head or gasket has failed, allowing coolant to mix with oil.