Exhaust Gasket – Fits Yamaha 6C/8C Outboards (Replaces 6G1-41114-A0)

$5.49 $8.00

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Exhaust Gasket – Fits Yamaha 6C/8C Outboards (Replaces 6G1-41114-A0) is backordered and will ship as soon as it is back in stock.

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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This aftermarket Exhaust Gasket – Fits Yamaha 6C/8C Outboards is a direct-fit replacement for the exhaust outer cover on Yamaha 6C/T/M/D and 8C/M/T series outboard motors. It ensures a proper seal for the exhaust assembly, preventing leaks and maintaining engine performance.

It serves as a direct interchange for Yamaha 6G1-41114-A0-00, Sierra 18-99113, and Mercury 11456.

Designed for direct, hassle-free installation.
Made from durable composite material to withstand the marine environment.
Specifically engineered for the exhaust outer cover assembly.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Yamaha	6G1-41114-A0-00
Sierra	18-99113
Mercury	11456

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket is designed for specific Yamaha 6 and 8 HP outboard models.

Brand	Model	Rated HP	OEM Part No.
Yamaha	6C/T/M/D	6	6G1-41114-A0-00
Yamaha	8C/M/T	8	6G1-41114-A0-00

Technical Specs

Product Type: Exhaust Outer Cover Gasket
Installation: Direct replacement
Housing Material: Composite
Dimensions: 0.5" H x 16.0" W x 21.5" L
Warranty: Standard manufacturer warranty
Other Technical Attributes: For exhaust outer cover assembly

What’s in the Box

1 x Gasket, Exhaust Outer Cover (replaces 6G1-41114-A0-00)

Installation Notes

Disconnect the battery and ensure the engine is cool.
Remove the engine cowling and any ajoining components to access the exhaust outer cover.
Carefully unbolt and remove the exhaust cover. Note the orientation of bolts and components.
Remove the old gasket and thoroughly clean both mating surfaces of any residue or corrosion.
Position the new gasket correctly on the engine block.
Reinstall the exhaust cover, tightening bolts to the manufacturer's recommended torque specification in a star or crisscross pattern.
Reconnect the battery, start the engine, and check for any exhaust leaks around the cover.

Troubleshooting & FAQ

How do I know if my exhaust gasket is failing?

Signs of a bad exhaust gasket include a noticeable exhaust leak (louder engine noise), visible soot or black streaks around the cover, water leaking from the joint, or a loss of engine performance. A visual inspection is the best method of confirmation.

Is this gasket compatible with models not listed?

We only guarantee fitment for the models explicitly listed in the compatibility table. Using it on other engines is not recommended, as even minor differences in shape or thickness can cause leaks.

Can I reuse my old gasket?

No. Gaskets are designed for one-time use. They compress and deform to create a seal and will not provide a reliable seal if reused. Always install a new gasket when the component is removed.

What is the difference between this and the OEM part?

Our aftermarket gasket is designed to meet or exceed OEM specifications for fit, material, and performance. It provides a reliable seal at a more competitive price point without sacrificing quality.

Do I need any sealant with this gasket?

Generally, this type of gasket is designed to be installed dry. Applying sealants can sometimes interfere with its ability to seal correctly unless specified by the engine manufacturer's service manual. Always follow the service manual for your specific engine.

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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