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Cylinder Head Cover Gasket

Part Number: 12391-ZE1-000
HondaHonda Marine
Availability: 25+ in stock
Price: $5.00
Ships within 1 business day
Product Information
Manufacturer: Honda, Honda Marine
Product Number: 12391-ZE1-000
Classification: Part
Weight: 0.03 lbs.
Shipping: Ships Worldwide
This is an authentic manufacturer-sourced replacement part which is specially designed for use with Honda engines commonly installed on lawn and garden equipment. The purpose of this special gasket is to provide an air-tight seal for the cylinder cover, over time gaskets tend to deteriorate and crack eventually requiring a replacement to maintain a proper seal. It is a high-quality component which is made of durable composite material and is sold individually.

This part is compatible with the following machines:

GX110 (Type QA)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type QX)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type QXA)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type QXC)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type TX)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type VA)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type VH)(VIN# GX110-1000001-2454428) Small Engine
GX120K1 (Type AR)(VIN# GC01-2000001-4299999) Small Engine
GX110 (Type VX)(VIN# GX110-1000001-2454428) Small Engine
GX120K1 (Type AR/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type HT2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type H1)(VIN# GC01-4300001) Small Engine
GX120K1 (Type HT2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type HTF2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type HT24)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type HX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type HTF2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type HX/A)(VIN# GC01-4300001) Small Engine
GX120K1 (Type HX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type HX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type HXQ)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type KRS4)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type KRS4/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type KRS5)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type KRS6)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type L1)(VIN# GC01-4300001) Small Engine
GX120K1 (Type LJD2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type LJD2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type LW2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type LX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type LX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type PM2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type PX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type PX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type PX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type PX/A)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type Q1)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QA/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QA)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QA2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QA2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QAA2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QH2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QJG2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QJG2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QMX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QMX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QTC2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QWA4)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QX/A)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type QXC)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QXC9)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QXC9/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QXS)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QXG)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QXS2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QXG2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type RD)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type QXS2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type QXQ)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type RD/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type R1)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type RX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type RX/A)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type SJD2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type S1)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type SJD2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type SG24)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SM12)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SMW2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SM12/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type SMW2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type SSX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type SSK2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SW2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SSX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SWX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type SX/A)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type SWX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type TX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type TX/A)(VIN# GC01-4300001-9099999) Small Engine
GX110 (Type DA)(VIN# GX110-1000001-2454428) Small Engine
GX110 (Type HX)(VIN# GX110-1000001-2454428) Small Engine
GX120K1 (Type TX2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type VX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type TX2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type VX/A)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type WKT2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type UX)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type WKT2/A)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type W1)(VIN# GC01-4300001-4299999) Small Engine
GX120K1 (Type VA)(VIN# GC01-2000001-4299999) Small Engine
GX120T1 (Type QW24)(VIN# GCAAT-1000001-9999999) Small Engine
GX120K1 (Type VPM4)(VIN# GC01-4300001-9099999) Small Engine
GX120K1 (Type WME2)(VIN# GC01-2000001-4299999) Small Engine
GX120K1 (Type WD12)(VIN# GC01-2000001-4299999) Small Engine
GX120T1 (Type QX2)(VIN# GCAAT-1000001-9999999) Small Engine
GX120T1 (Type TX)(VIN# GCAAT-1000001-9999999) Small Engine
GX120T1 (Type QA2)(VIN# GCAAT-1000001-9999999) Small Engine
GX120T1 (Type QXS2)(VIN# GCAAT-1000001-9999999) Small Engine
GX120T1 (Type TX2)(VIN# GCAAT-1000001-9999999) Small Engine
GX120T1 (Type SG24)(VIN# GCAAT-1000001-9999999) Small Engine
GX120T1 (Type WKT2)(VIN# GCAAT-1000001-9999999) Small Engine
GX120U1 (Type DKR)(VIN# GCAHK-1000001) Small Engine
GX120T1 (Type SWX2)(VIN# GCAAT-1000001-9999999) Small Engine
GX120U1 (Type AR)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HHQ4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HTF2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HT2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HXU)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HX2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HT24)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRA4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HX26)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRS4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRF4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRS5)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type HX4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LAJ4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRR4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRS6)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LHQ4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type KRT4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LSJ4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LSB)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LX2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LSD2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LX4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type LXU)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type PX2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QA2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QLL)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QH26)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QMA4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QHQ4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QMX2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QMA8)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QJG2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QWA4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QME4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QX4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QX2)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QX7)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QXU)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type RX4)(VIN# GCAHK-1000001) Small Engine
GX120U1 (Type QX26)(VIN# GCAHK-1000001) Small Engine
Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Engine
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
1 of 1 people found this instruction helpful
Tool Type:
Parts Used:
Carburetor Gasket - 16221-ZH8-801
Cylinder Head Cover Gasket - 12391-ZE1-000
Cover- Head - 12310-ZE1-020
Repair Difficulty:
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Socket set
Just replaceing with new.
Removed old cover and gasket and replaced with new.
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Tool Type:
Parts Used:
Spark Plug - W20Epr-U - Denso - 98079-56855
Cylinder Head Cover Gasket - 12391-ZE1-000
Gasket- Case Cover - 11381-ZL0-000
Repair Difficulty:
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Wrench Set
Compression relief wasn’t working.
1. Removed engine from pressure washer.
2. Removed six bolts to remove side cover to access camshafts.
3. Discovered plastic pieces and wire insulation jamming up the compression relief mechanism on the camshaft. Plastic pieces and wire insulation came from the low oil pressure switch, somehow the wire to the pressure switch got got on the crankshaft tearing the insulation off and breaking the plastic molding around the fitting that passes through the block.
4. Had to order low oil pressure switch.
5. Removed the two screws holding the switch and the 10mm nut on the outside of the block, where the fitting passes through the block.
6. Reinstalled the pressure switch.
7. Cleaned out the debris in the compression relief mechanism and insured it was working freely.
8. Removed the valve cover and pulled out the pushrods to help reinstall the camshaft.
9. Lined up the timing marks on the camshaft and the crankshaft and slide the camshaft into position.
10. Cleaned off the old case gasket, installed the new one, and reinstalled the case cover. Tightened the six bolts.
11. Removed the four 10mm bolts on the valve cover and removed it.
12. Loosened the nuts on the rocker arms and reinstalled the pushrods.
13. With the piston at top dead center, adjusted the gap on the intake valve to .006 and then adjusted the exhaust valve gap to .008.
14. Cleaned off the old valve cover gasket and using the new gasket, reinstalled the valve cover, tightening the four 10mm bolts.
15. Removed the spark plug, checked the gap on the new plug and reinstalled the plug.
16. Removed the 10mm bolt on bottom of carburetor bowel
17. Cleaned out the carburetor bowel, installed new baskets on the bowel and the 10mm bolt and put the carburetor bowel back on.
18. Removed the wing nuts holding on the air cleaner cover and the air filter.
19. Removed the three 10mm bolts holding on the plastic hosing over the carburetor.
20. Removed the two Phillips screws holding on the metal cover to the top of the gas shutoff.
21. Removed the cover, spring washer and the shutoff lever, to access the shutoff valve rubber gasket.
22. Installed new shutoff rubber gasket.
23. Reinstalled the shutoff lever spring washer, cover and two Phillips screws.
24. Verified the shutoff valve was working and no gas was leaking out of the bottom of the
carburetor bowel.
25. Replaced the plastic housing cover and reinstalled the three 10mm bolts.
26. Installed the air filter and cover, held in place with two wing nuts.
27. Filled the crankcase with 0.625 quart of 30w oil.
28. Checked for oil leaks.
29. With the gas and choke in the on position, pulled the rope starter and started the engine.
30. Much easier pulling the starter rope, with the compression relief valve working. Motor didn’t kick back and rip the stater rope handle out of my hand.
31. With the engine running, shut off the gas valve and let the engine run out of gas to verify gas shutoff valve was working correctly.
32. Reinstalled the engine on the pressure washer.
33. Connected the water hose to pressure washer and started the engine.
34. Pressure washed the motor in my truck.
35. Pressure washer worked great and the motor didn’t rip the starter handle out of my hand when starting.
36. Successful repair!
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Tool Type:
Parts Used:
Cylinder Head Cover Gasket - 12391-ZE1-000
Cylinder Head - 12210-ZL0-405
Gasket- Cylinder Head - 12251-ZL0-003
Repair Difficulty:
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Nutdriver
Damaged sparkplug threads on Honda GX200
1. Drained fuel.
2. Removed flywheel shroud and rotated engine to TDC prior to combustion
3. Removed carburetor assembly
4. Removed exhaust assembly
5. Removed cylinder head
6. Transferred exhaust bolts studs to new head
7. Transferred valves and stem seal (intake) to new head (7ft-lbs on valve pivot bolts, .006
intake/.008 exhaust at TDC)
8. Reinstall head (17ft-lbs on head bolts) Tighten in cross pattern - pass1: finder tight,
pass2: half torque, pass3: Full torque
9. Reinstall other components in reverse order

Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Parts Used:
Cylinder Head Cover Gasket - 12391-ZE1-000
Gasket- Case Cover - 11381-ZH8-801
Gasket- Cylinder Head - 12251-Z1T-003
Repair Difficulty:
Time Spent Repairing:
1-2 hours
Tools Used:
Socket set, Wrench Set
Showed how to disassemble and reassemble engine for a class.
This took a while, as we met for only about 40 min each week. I used the gaskets to replace old ones as we disassembled and reassembled the engine.
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Average Rating (out of 5):
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  • Good fit
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    Guest - September 24, 2019 Verified Purchase
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    Parts came in good time and were easy to find.
    Guest - June 1, 2022 Verified Purchase
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    Product Information
    Manufacturer: Honda, Honda Marine
    Product Number: 12391-ZE1-000
    Classification: Part
    Weight: 0.03 lbs.
    Shipping: Ships Worldwide

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