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

NGK IZFR5J – Trusted OEM spark plug
Suitable for Mercury/Mariner Optimax 75–125HP (3-cylinder)
Delivers strong ignition and smooth performance
Helps maintain fuel economy and clean combustion
Pre-gapped and ready to install

Why Buy from SSI MARINE?

All parts are in UK stock
Carefully selected based on real workshop experience
Collection available from our Leigh (Manchester) unit
Open Monday to Friday, 9 AM to 5 PM
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

Fast UK dispatch
Collection available from our Leigh workshop
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.

3@ NGK Spark Plug Mercury Mariner 75HP 90HP 115HP 125HP Optimax DFI Outboard