Head Cover Gasket – Fits Yamaha 4HP-5HP Outboard Motors (Replaces 6E0-11193-A1-00)
Head Cover Gasket – Fits Yamaha 4HP-5HP Outboard Motors (Replaces 6E0-11193-A1-00) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Head Cover Gasket – Fits Yamaha 4HP-5HP Outboard Motors (Replaces 6...
Product Details
This aftermarket Head Cover Gasket – Fits Yamaha 4HP-5HP Outboard Motors (Replaces 6E0-11193-A1-00) creates a proper seal between the cylinder head and the head cover. It is designed for a precise fit on Yamaha 4HP and 5HP 2-stroke outboard motors manufactured from the early 1980s through the mid-1990s.
Directly interchanges with Yamaha part numbers 6E0-11193-01-00 and 6E0-11193-A1-00, and Mariner part number 27-99991M.
- Installs as a direct OEM-equivalent replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6E0-11193-A1-00 |
| Yamaha | 6E0-11193-01-00 |
| Mariner | 27-99991M |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Outboards: This gasket is confirmed to fit the following 4HP and 5HP 2-stroke models.
For Mariner Outboards: This part cross-references to Mariner 4A models that use part number 27-99991M.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 4ACMH | 4 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 4A | 4 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 4AS | 4 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 4MSH | 4 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 4KZ | 4 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 4AC | 4 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 5C | 5 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 5CS | 5 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Yamaha | 5ACMH | 5 | 2-Stroke | 6E0-11193-A1-00 | - | |
| Mariner | 4A | 4 | 2-Stroke | 27-99991M | - |
Technical Specs
- Product Type
- Head Cover Gasket
- Installation
- OEM Replacement
- Compatible With
- Yamaha 4HP-5HP 2-Stroke Outboard Motors
- Dimensions
- 12.0" L x 10.0" W x 0.1" H
- OEM Part Numbers
- Yamaha 6E0-11193-A1-00, 6E0-11193-01-00
What’s in the Box
- 1 x Head Cover Gasket (6E0-11193-A1-00)
Installation Notes
- Ensure the engine is off and cool to the touch before beginning. Disconnect the spark plug lead for safety.
- Remove the engine's top cowl to access the powerhead.
- Carefully unbolt and remove the cylinder head cover. Note the sequence and location of any different-sized bolts.
- Remove the old head cover gasket and discard it.
- Thoroughly clean any residual gasket material from both the cylinder head and the cover's mating surfaces. Ensure both surfaces are clean, dry, and free of oil or debris.
- Position the new gasket correctly on the cylinder head.
- Reinstall the head cover, ensuring it is properly aligned.
- Tighten the bolts in the sequence and to the torque value specified in your service manual. Overtightening can damage the gasket or cover.
- Reconnect the spark plug lead and replace the engine cowl.
Troubleshooting & FAQ
How do I know if my head cover gasket is failing?
Common signs of a bad head cover gasket include visible oil leaks around the edge of the cover, a drop in engine compression, or a noticeable loss of performance. You may also see a milky or foamy substance on the dipstick or oil cap, indicating water has mixed with the oil.
Is this gasket compatible with 4-stroke Yamaha models?
No, this gasket is specifically designed for the 2-stroke Yamaha 4HP and 5HP models listed in the compatibility table. It will not fit 4-stroke engines.
What is the recommended replacement interval?
A head cover gasket does not have a fixed replacement interval. It should be replaced whenever the head cover is removed for service, or if it shows signs of leaking or damage.
Can I reuse my old gasket if it looks okay?
No. Head cover gaskets are single-use components designed to compress and create a seal. Reusing an old gasket will likely result in improper sealing and lead to oil or compression leaks.
Do I need to use sealant with this gasket?
Typically, these gaskets are designed to be installed dry without any additional sealant. Always consult your engine's official service manual for model-specific instructions, as some applications may have unique requirements.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
