Exhaust Inner Cover Gasket – Fits Yamaha 40/50HP 3-Cylinder (Replaces 6H4-41112-A0-00)
Exhaust Inner Cover Gasket – Fits Yamaha 40/50HP 3-Cylinder (Replaces 6H4-41112-A0-00) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Inner Cover Gasket – Fits Yamaha 40/50HP 3-Cylinder (Replac...
Product Details
This aftermarket Exhaust Inner Cover Gasket is engineered for a precise fit on Yamaha 40HP and 50HP 3-cylinder 2-stroke outboard models manufactured between 1991 and 1993. It serves as a direct-fit replacement, ensuring a reliable seal for the exhaust system components.
It provides a direct interchange for Yamaha part numbers 6H4-41112-00-00 and 6H4-41112-A0-00, as well as Pro Marine's aftermarket equivalent 2236.
- Installation Method: Direct replacement
- Engine Environment: Outboard marine engines
- Included Essentials: 1 gasket per package
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6H4-41112-00-00 |
| Yamaha | 6H4-41112-A0-00 |
| Pro Marine | 2236 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 25QEO (61C) | 25 | 2-Stroke | 1991 | 6H4-41112-A0-00 | International |
| Yamaha | 40H (6H4) | 40 | 2-Stroke | 1991–1993 | 6H4-41112-A0-00 | International |
| Yamaha | 40HE (6H4) | 40 | 2-Stroke | 1993 | 6H4-41112-A0-00 | International |
| Yamaha | 50D (6H5) | 50 | 2-Stroke | 1991 | 6H4-41112-A0-00 | International |
| Yamaha | 50DE (6H5) | 50 | 2-Stroke | 1993 | 6H4-41112-A0-00 | International |
Technical Specs
- Product Type
- Exhaust Inner Cover Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Dimensions
- 8.0" x 12.0" x 0.25"
- Design
- Built to OEM specifications
What’s in the Box
- 1 x Exhaust Inner Cover Gasket (replaces 6H4-41112-A0-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Remove the engine cowling and locate the exhaust inner cover.
- Carefully remove the bolts securing the cover. Note their positions if they are different lengths.
- Remove the old gasket and clean both mating surfaces thoroughly. Remove all old gasket material and corrosion.
- Position the new gasket correctly on the engine block.
- Reinstall the exhaust inner cover and tighten the bolts in a crisscross pattern to the manufacturer's specified torque.
- Reconnect the battery and test the engine for exhaust leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket is for specific Yamaha 40HP and 50HP 3-cylinder 2-stroke models from 1991–1993. Please cross-reference your engine's model number and year with the compatibility table above. Visually comparing your old part to our product images is also a crucial step.
What are the signs of a failing exhaust cover gasket?
Common symptoms include a noticeable exhaust leak (hissing or popping sounds), loss of engine power, rough idling, or visible soot/exhaust residue around the cover plate. These signs indicate the seal is compromised and should be replaced.
Do I need to use sealant with this gasket?
Typically, this type of gasket is designed to be installed dry without any additional sealant. Applying sealants can sometimes cause the gasket to slip or fail prematurely. Always follow your engine's service manual for the most accurate procedure.
Is this gasket reusable?
No. This is a single-use compression gasket. Once it has been installed and torqued to specification, it should not be reused. Always use a new gasket whenever the component is removed to ensure a proper seal.
How often should this gasket be replaced?
This gasket does not have a set replacement interval. It should be replaced whenever the exhaust cover is removed for service or if you detect any signs of a leak or failure.
Is this an OEM or aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency.
What are your shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty & return policy?
This part is 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.
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