Upper Casing Gasket – Fits Yamaha 50HP 60HP 70HP Outboards (Replaces 6H3-45113-A0, 6H3-45113-00, 6H3-45113-A1)
Upper Casing Gasket – Fits Yamaha 50HP 60HP 70HP Outboards (Replaces 6H3-45113-A0, 6H3-45113-00, 6H3-45113-A1) 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
Product Details
This aftermarket Upper Casing Gasket – Fits Yamaha 50HP 60HP 70HP Outboards provides a reliable seal for the upper casing assembly on select Yamaha 2-stroke outboard motors manufactured between 1984 and 1994.
It serves as a direct interchange for Yamaha OEM part numbers 6H3-45113-A0-00, 6H3-45113-A0, 6H3-45113-00, and 6H3-45113-A1.
- Engineered for direct replacement installation.
- Designed for gasoline-fueled 2-stroke outboard engines.
- Mounts securely between upper casing sections to prevent leaks.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6H3-45113-A0-00 |
| Yamaha | 6H3-45113-A0 |
| Yamaha | 6H3-45113-00 |
| Yamaha | 6H3-45113-A1 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Compatible with the following Yamaha outboard models:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 70ETLN | 70 | 2-Stroke | 1984 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70ETLK | 70 | 2-Stroke | 1985 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70ETLJ | 70 | 2-Stroke | 1986 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70ETLH | 70 | 2-Stroke | 1987 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70ETLG | 70 | 2-Stroke | 1988 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70ETLF | 70 | 2-Stroke | 1989 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70ETLD | 70 | 2-Stroke | 1990 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70TLRP | 70 | 2-Stroke | 1991 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70TRP | 70 | 2-Stroke | 1991 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | P60TLHP | 60 | 2-Stroke | 1991 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70TLRQ | 70 | 2-Stroke | 1992 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | P60TLHQ | 60 | 2-Stroke | 1992 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70TLRR | 70 | 2-Stroke | 1993 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | P60TLHR | 60 | 2-Stroke | 1993 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70TLRS | 70 | 2-Stroke | 1994 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | 70TRS | 70 | 2-Stroke | 1994 | 6H3-45113-A0 | UPPER CASING |
| Yamaha | P60TLHS | 60 | 2-Stroke | 1994 | 6H3-45113-A0 | UPPER CASING |
Technical Specs
- Product Type
- Upper Casing Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Connection
- Mounts between upper casing sections
- Dimensions
- 28.0" L x 18.0" W x 3.0" H
- Fitting Type
- Direct fit
- Other Technical Attributes
- For 2-stroke outboard engines
What’s in the Box
- 1 x Upper Casing Gasket (Replaces 6H3-45113-A0-00, 6H3-45113-A0, 6H3-45113-00, 6H3-45113-A1)
Installation Notes
- Ensure the engine is turned off and the battery is disconnected for safety.
- Drain any necessary fluids, such as engine oil or coolant, to prevent spills.
- Carefully disassemble the components required to access the upper casing gasket.
- Remove the old gasket and thoroughly clean both mating surfaces of any residue or old sealant.
- Position the new gasket correctly on the clean surface, ensuring all bolt holes align.
- Reassemble the engine components in the reverse order of disassembly.
- Torque all bolts to the manufacturer's specified values. Do not overtighten.
- Refill any drained fluids and reconnect the battery.
- Start the engine and carefully inspect for any signs of leaks around the new gasket.
Troubleshooting & FAQ
Which Yamaha engines does this gasket fit?
This gasket fits a specific range of Yamaha 60HP and 70HP 2-stroke outboard models from 1984 to 1994. While the title mentions 50HP, we have only verified compatibility for 60HP and 70HP models. Always check the detailed compatibility table on this page to confirm your exact engine model and year before ordering.
How do I know if my upper casing gasket is failing?
Common signs of a worn or failing gasket include visible oil or water leaks around the seam between the upper casing sections, engine overheating due to coolant loss, or a noticeable decrease in engine performance.
Do I need to use sealant with this gasket?
This gasket is typically designed to be installed dry. However, we always recommend consulting your engine’s official service manual for model-specific instructions regarding the use of supplemental sealants.
Is this part a direct replacement for my original gasket?
Yes, this is a direct-fit aftermarket part designed to replace Yamaha OEM numbers 6H3-45113-A0, 6H3-45113-00, 6H3-45113-A1, and 6H3-45113-A0-00. It is engineered to match the form and function of the original component.
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.
