Upper Casing Gasket – Fits Yamaha 4HP/5HP 2-Stroke Outboards (Replaces 6E0-45113-A1-00)
Upper Casing Gasket – Fits Yamaha 4HP/5HP 2-Stroke Outboards (Replaces 6E0-45113-A1-00) 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
Upper Casing Gasket – Fits Yamaha 4HP/5HP 2-Stroke Outboards (Repla...
Product Details
This high-quality aftermarket Upper Casing Gasket is designed for a precise fit on Yamaha 4HP and 5HP 2-stroke outboard motors manufactured between 1985 and 1993, including 4A, 4AC, 4AS, 5C, and 5CS models. It ensures a reliable seal at the engine base and cylinder block junction.
This part directly replaces Yamaha OEM part numbers 6E0-45113-A1-00, 6E0-45113-A0-00, and 6E0-45113-00-00, and serves as an aftermarket equivalent for ITACO 6E0-45113-A1-00.
- Installation Location: Engine Base/Cylinder Block Junction
- Fuel Compatibility: Gasoline
- Country of Origin: Japan (OEM)
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6E0-45113-A1-00 | Current part. Supersedes 6E0-45113-A0-00 & 6E0-45113-00-00. |
| Yamaha | 6E0-45113-A0-00 | Superseded by 6E0-45113-A1-00. |
| Yamaha | 6E0-45113-00-00 | Superseded by 6E0-45113-A0-00. |
| ITACO | 6E0-45113-A1-00 | Aftermarket cross-reference. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is a direct fit for the following Yamaha outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 4AC (6E0) | 4 | 2-Stroke | 1985–1991, 1993 | 6E0-45113-A1-00 | Supersedes 6E0-45113-A0-00 |
| Yamaha | 4A (6E2) | 4 | 2-Stroke | 1987 | 6E0-45113-A1-00 | Supersedes 6E0-45113-A0-00 |
| Yamaha | 4AS (6E1) | 4 | 2-Stroke | 1987–1991, 1993 | 6E0-45113-A1-00 | Supersedes 6E0-45113-A0-00 |
| Yamaha | 5C (6E3) | 5 | 2-Stroke | 1985–1990, 1993 | 6E0-45113-A1-00 | Supersedes 6E0-45113-A0-00 |
| Yamaha | 5CS (6E4) | 5 | 2-Stroke | 1987–1990, 1993 | 6E0-45113-A1-00 | Supersedes 6E0-45113-A0-00 |
It is also a compatible replacement for certain aftermarket engine models.
| Brand | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Powertec | 4-5 | 2-Stroke | 6E0-45113-A1-00 | Aftermarket equivalent |
| Hidea | 4-5 | 2-Stroke | 6E0-45113-A1-00 | Aftermarket equivalent |
| Seatec | 4-5 | 2-Stroke | 6E0-45113-A1-00 | Aftermarket equivalent |
| Parsun | 4-5 | 2-Stroke | 6E0-45113-A1-00 | Aftermarket equivalent |
Technical Specs
- Product Type
- Upper Casing Gasket
- Installation
- Engine Base/Cylinder Block Junction
- Fuel Type
- Gasoline
- Dimensions
- 25.5 cm L x 14.5 cm W x 0.2 cm H
- Other Technical Attributes
- Country of Origin: Japan (OEM)
What’s in the Box
- 1 x Gasket, Upper Casing (6E0-45113-A1-00)
Installation Notes
- Ensure the engine is off and cool. Disconnect the spark plug lead for safety.
- Remove any covers or components blocking access to the upper casing joint.
- Carefully unbolt and separate the casing components.
- Remove the old gasket completely. Use a plastic scraper to avoid damaging the metal surfaces.
- Thoroughly clean both mating surfaces, ensuring they are dry and free from all old gasket material, oil, and debris.
- Carefully position the new gasket onto the lower surface, aligning it with the bolt holes.
- Reassemble the casing and tighten the bolts in the sequence and to the torque specified in your engine's service manual. Do not overtighten.
- Reconnect the spark plug lead and test the engine, checking carefully for any leaks.
Troubleshooting & FAQ
How do I know if my upper casing gasket is failing?
Signs of a failing gasket include oil or water leaks around the seam of the engine casing, unexplained loss of compression, engine overheating, or milky/contaminated oil. A visual inspection may also reveal cracks, brittleness, or physical damage to the gasket.
My Yamaha model isn't on your list. Will this part still fit?
If your specific model or year is not listed, do not purchase this part without confirming the OEM part number. Please check your engine's service manual or original part to see if it specifies part number 6E0-45113-A1-00 or one of its predecessors.
Is sealant required for this gasket installation?
This gasket is typically designed to be installed dry. Applying sealant can sometimes cause it to slip out of place during assembly. Always follow the specific instructions in your outboard's official service manual, as recommendations can vary.
Why does the part number on my old gasket look different?
This part (6E0-45113-A1-00) is the latest version from Yamaha. It supersedes older part numbers like 6E0-45113-A0-00 and 6E0-45113-00-00. If your old part has one of these numbers, this new one is the correct replacement.
Is this gasket compatible with ethanol-blended fuels?
Yes, this aftermarket gasket is manufactured with modern materials designed to be resistant to the corrosive effects of common ethanol-blended marine fuels.
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.
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