3@ NGK Spark Plug Mercury Mariner 75HP 90HP 115HP 125HP Optimax DFI Outboard
PRODUCT DETAILS
3x NGK IZFR5J Spark Plugs – Mercury / Mariner Optimax 75HP 90HP 115HP 125HP (3-Cylinder Models)
Genuine NGK Plugs – UK Stock – SSI MARINE
Product Description
This listing is for 3x NGK IZFR5J spark plugs, suitable for Mercury and Mariner Optimax 75HP, 90HP, 115HP, and 125HP 3-cylinder outboards.
These are genuine NGK marine-grade plugs, trusted for consistent ignition performance, reliability, and durability in high-output 2-stroke outboards like the Optimax range.
Designed for 3-cylinder Optimax models only.
Product Features
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NGK IZFR5J – Trusted OEM spark plug
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Suitable for Mercury/Mariner Optimax 75–125HP (3-cylinder)
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Delivers strong ignition and smooth performance
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Helps maintain fuel economy and clean combustion
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Pre-gapped and ready to install
Why Buy from SSI MARINE?
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All parts are in UK stock
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Carefully selected based on real workshop experience
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Collection available from our Leigh (Manchester) unit
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Open Monday to Friday, 9 AM to 5 PM
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Friendly, knowledgeable support available if you’re unsure about compatibility
Important: Just because a plug looks the same doesn’t mean it’s the correct one for your engine. Please check part numbers and specs—or contact us before purchasing.
Shipping & Collection
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Fast UK dispatch
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Collection available from our Leigh workshop
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Tracked delivery with same-day dispatch on orders before 1 PM
Buy with confidence from SSI MARINE – the right parts, trusted advice, and fast UK service.
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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