Powerhead Casing Base Gasket – Fits Yamaha Outboard 115-150 HP (Replaces 6G5-45113-A0-00, 6G5-45113-A1-00, 6G5-45113-A2-00)
Powerhead Casing Base Gasket – Fits Yamaha Outboard 115-150 HP (Replaces 6G5-45113-A0-00, 6G5-45113-A1-00, 6G5-45113-A2-00) 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
Powerhead Casing Base Gasket – Fits Yamaha Outboard 115-150 HP (Rep...
Product Details
This Powerhead Casing Base Gasket ensures a secure, leak-free seal for the powerhead assembly on Yamaha 2-stroke outboard engines, including 115, 130, and 150 HP models. It is built to precise OEM specifications for reliable performance and durability in marine environments.
It serves as a direct replacement for Yamaha part numbers 6G5-45113-A0-00, 6G5-45113-A1-00, and 6G5-45113-A2-00, and is a direct interchange for Sierra Marine 18-0813.
- Direct replacement installation requires no modifications.
- Engineered to meet or exceed original equipment specifications.
- Designed for use in gasoline marine engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6G5-45113-A0-00 | 6G5-45113-A1-00 |
| Yamaha | 6G5-45113-A1-00 | 6G5-45113-A2-00 |
| Yamaha | 6G5-45113-A2-00 | |
| Sierra Marine | 18-0813 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed for specific Yamaha 2-stroke outboard models. Please verify your part number before ordering.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | Outboard | 115 | 2-Stroke | 6G5-45113-A0-00 | Superseded by A1-00, then A2-00 |
| Yamaha | Outboard | 130 | 2-Stroke | 6G5-45113-A0-00 | Superseded by A1-00, then A2-00 |
| Yamaha | Outboard | 150 | 2-Stroke | 6G5-45113-A0-00 | Superseded by A1-00, then A2-00 |
Technical Specs
- Product Type
- Powerhead Casing Base Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Dimensions
- 8.25" x 12.0" x 0.25"
- Other Technical Attributes
- Built to OEM specifications
What’s in the Box
- 1 x Powerhead Casing Base Gasket (6G5-45113-A2-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool before starting work.
- Drain necessary fluids, such as cooling water, according to your service manual.
- Carefully disassemble the components required to access the powerhead base joint.
- Remove the old gasket. Thoroughly clean both mating surfaces to remove all old gasket material and debris.
- Position the new gasket correctly onto the casing. Ensure it is flat and properly aligned.
- Reassemble all components in the reverse order of disassembly. Tighten all bolts to the manufacturer's specified torque sequence and values.
- Refill fluids, reconnect the battery, and carefully start the engine. Check for any leaks around the repaired area.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific engine?
This gasket fits Yamaha 115, 130, and 150 HP 2-stroke outboard engines that use part numbers 6G5-45113-A0-00, 6G5-45113-A1-00, or 6G5-45113-A2-00. The best way to confirm is to cross-reference the part number stamped on your old gasket or listed in your engine's service manual.
What are the signs of a failing powerhead base gasket?
Common symptoms include water in the cylinders, engine overheating, reduced compression, an unstable idle, or visible water and oil leaks between the engine block and the lower casing.
Can I reuse my old gasket after disassembly?
No. Gaskets are single-use components that compress to create a seal. Reusing a gasket will almost certainly lead to leaks and potential engine damage.
What is the difference between this and an OEM gasket?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency and quality.
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 and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, 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 quality control.
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