Cylinder Head Cover w/ Gasket & Intake Manifold Boot for Honda Recon 250 TRX250TE/TM Sportrax TRX250EX/X 2002-2014 12310-HN6-010 16211-HN6-000

Solve your high-idle and starting issues in one go. This kit fixes the most common vacuum leak and oil seep points on the TRX250 engine.

 

Brand Name: M MATI

Origin: Mainland China

For ATV Brand/Model: Honda

Special Features: Cylinder Head Cover 

MPN :

12310-HN6-010 12315-HN6-010 12200-HM8-A40
14711-HM8-A40 14721-HM8-A40 14711-HN6-000 14721-HN6-000
14751-HN6-000 14761-HN6-000 14781-HA0-770 14775-HM8-A40 14771-107-020
12209-KL4-005 12209-HM8-A4112200-HM8-A40
14711-HM8-A40 14721-HM8-A40 14711-HN6-000 14721-HN6-000 14751-HN6-000 14761-HN6-000 14781-HA0-770 14775-HM8-A40 14771-107-020
12209-KL4-005 12209-HM8-A41

Package :    

Cylinder Head Cover x1  Cylinder Head Kit x1  

Cylinder Head Cover Gasket x1   Cylinder Base Gasket x1  

Cylinder Top Gasket x1  Intake Manifold x1   Spark Plug x1

Warranty : 1 year

Condition:  New

Fit for following Honda ATV

Sportrax 250 TRX250EX 2001-2008
Recon 250 ES TRX250TE 2002-2009 2011-2014 2016-2024
Recon 250 TRX250TM 2002-2009 2011-2014 2016-2024
TRX250X 2009 2011-2014 2016-2024

🛠️ Installation Tips 

• Clean the Gasket Surface: Before installing the new head cover, use a plastic scraper to remove all traces of old gasket material. Avoid metal scrapers that can scratch the aluminum mating surface.

• Check Valve Clearances: Since you are removing the head cover, this is the perfect time to inspect and adjust your valve lash. It will save you from having to do the job twice.

• Torque Pattern: When tightening the head cover bolts, use a criss-cross (star) pattern to apply even pressure. This prevents the cover from warping and ensures a leak-free seal.

• Inspect Manifold Clamps: When installing the new intake boot, ensure the metal clamps are positioned correctly. An over-tightened clamp can tear the new rubber, while a loose one will cause a vacuum leak.

• Air Leak Test: After installation, start the engine and spray a tiny amount of carb cleaner around the intake boot. If the engine RPM changes, you have an air leak that needs sealing.

🔍 Troubleshooting Guide

Issue	Possible Cause	Solution
Erratic or High Idle	Air leak at the Intake Manifold Boot.	Inspect the boot for tiny cracks or loose clamps. A vacuum leak causes a "lean" condition, making the idle stay high.
Oil Seeping from Top	Flattened or hardened cover gasket.	Replace the head cover gasket. Over time, heat cycles make the rubber brittle, losing its ability to seal.
Engine "Popping" on Decel	Lean mixture from cracked intake.	When air enters through a crack in the manifold, it causes the engine to pop when you let off the throttle. Replace the boot immediately.
Difficulty Starting	Vacuum loss or poor compression seal.	If the intake boot is severely damaged, the engine cannot pull enough fuel from the carb. New seals restore the vacuum signal.
Tapping/Clicking Noise	Loose valves or loose cover.	Ensure the head cover is torqued to spec. If noise persists, adjust the valve clearance while the cover is off.