Exhaust Manifold Gasket – Fits Yamaha 6hp & 8hp Outboard Motors (Replaces 6G1-41133-A0-00)

$6.93 $11.00

Shipping calculated at checkout.

Exhaust Manifold Gasket – Fits Yamaha 6hp & 8hp Outboard Motors (Replaces 6G1-41133-A0-00) 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 high-quality aftermarket Exhaust Manifold Gasket is a direct-fit replacement for Yamaha 2-Stroke 6hp and 8hp outboard motors manufactured between 1984 and 1995. It ensures a proper seal between the exhaust manifold and the engine block, preventing leaks and maintaining engine performance.

This part provides a direct replacement for Yamaha OEM part numbers 6G1-41133-00-00 and 6G1-41133-A0-00, and is interchangeable with Sierra aftermarket part 99114.

Engineered for direct-fit installation.
Mounts between the exhaust manifold and the engine block.
Meets or exceeds genuine OEM replacement part specifications.

Part Number Matrix

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

Brand	Part Number	Superseded By	Notes
Yamaha	6G1-41133-00-00	6G1-41133-A0-00	Original part number.
Yamaha	6G1-41133-A0-00		Current OEM part number.
Sierra	99114		Aftermarket direct replacement.

Engine & Model Compatibility

Confirm your engine model and year in the table below to ensure accurate fitment.

This gasket is compatible with a range of Yamaha 6hp and 8hp 2-stroke outboard models.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Yamaha	6C	6hp	2-Stroke	1985–1992	6G1-41133-A0-00	Manual Starter, Tiller Handle, Manual Tilt
Yamaha	6C	6hp	2-Stroke	1995	6G1-41133-A0-00
Yamaha	6D	6hp	2-Stroke	1985–1990	6G1-41133-A0-00	Manual Starter, Tiller Handle, Manual Tilt
Yamaha	6LJ/6SJ	6hp	2-Stroke	1986	6G1-41133-A0-00
Yamaha	6LH/6SH	6hp	2-Stroke	1987	6G1-41133-A0-00
Yamaha	6LG/6SG	6hp	2-Stroke	1988	6G1-41133-A0-00
Yamaha	6LF/6SF	6hp	2-Stroke	1989	6G1-41133-A0-00
Yamaha	6LD/6SD	6hp	2-Stroke	1990	6G1-41133-A0-00
Yamaha	6MLHP/6MSHP	6hp	2-Stroke	1991	6G1-41133-A0-00
Yamaha	8N	8hp	2-Stroke	1984	6G1-41133-A0-00
Yamaha	8C	8hp	2-Stroke	1985–1993	6G1-41133-A0-00	Manual Starter, Tiller Handle, Manual Tilt
Yamaha	8C	8hp	2-Stroke	1995	6G1-41133-A0-00
Yamaha	8J	8hp	2-Stroke	1986	6G1-41133-A0-00
Yamaha	8LN/8SN	8hp	2-Stroke	1984	6G1-41133-A0-00
Yamaha	8LK/8SK	8hp	2-Stroke	1985	6G1-41133-A0-00
Yamaha	8LJ/8SJ	8hp	2-Stroke	1986	6G1-41133-A0-00
Yamaha	8LH/8SH	8hp	2-Stroke	1987	6G1-41133-A0-00
Yamaha	8LG/8SG	8hp	2-Stroke	1988	6G1-41133-A0-00
Yamaha	8LF/8SF	8hp	2-Stroke	1989	6G1-41133-A0-00
Yamaha	8LD/8SD	8hp	2-Stroke	1990	6G1-41133-A0-00
Yamaha	8MLHP/8MSHP	8hp	2-Stroke	1991	6G1-41133-A0-00
Yamaha	8CM/8EM	8hp	2-Stroke	1993–1994	6G1-41133-A0-00

Technical Specs

Product Type: Exhaust Manifold Gasket
Installation: Direct replacement
Fuel Type: Gasoline
Connection: Mounts between exhaust manifold and engine block
Dimensions: 6.0" H x 7.25" W x 0.63" L
Weight: 113g (4 oz)
Fitting Type: Direct fit
Warranty: Manufacturer warranty when purchased from authorized dealer
Other Technical Attributes: Genuine OEM replacement part

What’s in the Box

1 x Gasket, exhaust manifold (replaces 6G1-41133-A0-00)

Installation Notes

Ensure the engine is off and completely cool before beginning work. Disconnect the battery for safety.
Carefully detach any components obstructing the exhaust manifold.
Unbolt and remove the exhaust manifold from the engine block.
Remove the old gasket. Thoroughly clean both the manifold and engine block mating surfaces to remove any old gasket material or carbon buildup.
Position the new gasket correctly, aligning it with the bolt holes. Do not use sealant unless explicitly required by your engine's service manual.
Reinstall the exhaust manifold, tightening the bolts in the sequence and to the torque specifications recommended by the manufacturer.
Reconnect any components that were removed.
Reconnect the battery, start the engine, and carefully inspect for any exhaust leaks around the manifold.

Troubleshooting & FAQ

How do I know if this gasket will fit my specific engine?

This gasket is designed for Yamaha 6hp and 8hp 2-stroke outboard motors made between 1984 and 1995. To confirm fitment, please locate your engine's model and year in the detailed "Engine & Model Compatibility" table on this page.

What are the signs of a failing exhaust manifold gasket?

Common symptoms of a bad gasket include a distinct hissing or ticking sound from the engine, reduced power or performance, engine overheating, and visible black soot or carbon tracks around the sealing area of the exhaust manifold.

When should I replace this gasket?

The exhaust manifold gasket should be replaced any time the manifold is removed for other service. It is a single-use "crush" style gasket and should not be reused. You should also replace it immediately if you detect signs of a leak.

Do I need to use sealant with this gasket?

Typically, this type of gasket is designed to be installed dry, without any additional sealants. Using sealant can sometimes interfere with a proper seal. Always refer to your outboard's official service manual for the most accurate installation procedure.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for quality and consistency.

Shipping speed & cost?

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available for your location.

Warranty & returns?

This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in original condition. See our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part before purchase. If anything differs—even if your model appears on the compatibility list—do not purchase.
This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
Professional installation is highly recommended to ensure safety and proper performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
Fast Global Fulfillment — We provide free standard delivery to most regions, with typical transit times of 5–15 days.
Manufacturer-Direct Value — By working directly with manufacturers, we offer fair pricing without ever compromising on materials or quality control.

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.