PRODUCT DETAILS
4HP / 5HP Mariner Outboard Base Gasket – JAPAN Models Only (2-Stroke)
Replaces 27-91780 / 91780M – Yamaha-Built Mariner – UK Stock
Product Description
Base gasket for Mariner 4HP and 5HP 2-stroke outboards, Japan-built models made by Yamaha. These engines have serial numbers starting with 6E0 or 6E3 and share many parts with Yamaha’s 4A and 5C series.
This gasket fits between the powerhead and the midsection to properly seal the lower end of the engine. High-quality aftermarket part with OEM-style fit.
Fitment
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Mariner 4HP / 5HP
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2-Stroke
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Japan models only
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Serial number starts with 6E0 or 6E3
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Based on Yamaha 4A / 5C design
Will NOT fit Mariner engines made by Mercury USA or Belgium.
Replaces Mariner Part Numbers
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27-91780
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27-91780M
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91780
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91780M
Why Buy from SSI MARINE?
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All parts are stocked in the UK
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Selected by marine technicians for fit and quality
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Same-day dispatch before 1 PM (Mon–Fri)
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Collection available from our Leigh (Manchester) workshop
If you're unsure about compatibility, contact us with your serial number and we’ll confirm the fit.
Shipping & Collection
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Tracked 24-hour UK delivery
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Same-day dispatch before 1 PM
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In-person collection available Monday to Friday
SHIPPING & DELIVERY
Delivery:
We offer free shipping on all orders over £150 (excluded outboard engines, trailers)
Standard Shipping - £ 8.50
Orders are typically shipped within 1 business day of receipt of payment. We ship via Royal Mail Tracked 24 delivery service. Delivery times vary depending on the delivery destination.
For engines delivery cost please ask for a quote.
It is the buyer's responsibility to ensure that the correct shipping address is supplied.
All item(s) will be despatched to the registered address.
Tracking your order:
Once your order has been shipped, you will receive a tracking number via email. You can track your order online using the tracking number provided.
Returns:
We accept returns of unused and undamaged items within 30 days of purchase.
To return an item please contact us for a return authorisation number. Return shipping costs are the responsibility of the customer.
Refunds:
Refunds will be issued for the purchase price of the item, less shipping costs. Refunds will be issued in the same form of payment as the initial purchase.
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