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 & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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