Mercury – NGK IZFR5J Laser Iridium Spark Plug | Ignition System Component | 892567Q

Overview
Some parts work quietly in the background, but you feel their impact every time you throttle up. A spark plug seems simple, yet the right one brings your engine to life with clean, confident ignition. It smooths out the idle, sharpens throttle response, and keeps the entire power curve feeling steady. This Mercury Marine part delivers that familiar sense of dependability—the kind boaters notice the moment the engine settles into its rhythm.

Key Features
• Fine-wire Laser Iridium center electrode for strong, consistent ignition.
• Copper core for excellent heat transfer and long service life.
• Ribbed ceramic insulator helps prevent flashover and misfire.
• Pre-gapped to match engine manufacturer specifications.
• Trivalent metal plating for corrosion resistance and easy removal.
• Engineered for optimal fuel efficiency and reduced emissions.

Engine & Boat Compatibility
• Fits select Mercury Marine outboards using the IZFR5J plug specification.
• Compatible with modern Electronic Fuel Injection systems requiring Laser Iridium firing characteristics.
• Commonly used in mid-range and high-performance outboards.
• Ideal for fishing boats, runabouts, pontoons, aluminum skiffs, and offshore small craft.

Performance & Practical Benefits
When you run an engine tuned with the correct spark plug, everything feels tighter and more responsive. With this Laser Iridium design, ignition is crisp, even under load or during quick throttle changes. Idle becomes smooth and predictable. Acceleration feels more direct, especially when you push up onto plane or weave through chop.

The corrosion-resistant plating is a quiet advantage for most boaters. It keeps threads from binding and makes plug changes far easier, even after seasons of salt spray and humidity. The ceramic insulator adds strength and better heat control, helping reduce fouling on slower days when the engine spends time idling near mangroves, docks, or weed lines. It is the kind of part you install once and appreciate every time the motor lights off without hesitation.

Why Buy OEM
Using the plug your engine was designed for is more than a recommendation—it is protection. Mercury Marine tests these plugs for exact ignition timing, combustion quality, and long-term durability. Aftermarket versions may fit, but they often miss the fine tolerances your engine needs to perform at its best.

With an OEM component, you get predictable performance, consistent burn, and fewer fluctuations in idle or power. You also avoid the risk of running a plug with the wrong heat range, which can harm efficiency or even engine health. For boaters who value reliability, sticking with a Mercury Marine part is simply the smarter choice.

FAQ

Q1: Which engines use this spark plug?
Any Mercury engine that lists the IZFR5J specification in its owner’s manual or parts diagram.

Q2: What makes this plug better than aftermarket alternatives?
The fine-wire Laser Iridium tip provides stronger ignition, longer life, and cleaner performance.

Q3: How do I confirm it is the right plug?
Check your manual or the label on your current plug. If it calls for IZFR5J, this is the correct replacement.

Q4: Is it suitable for saltwater use?
Yes. The corrosion-resistant plating is designed for harsh marine environments.

Q5: Is installation easy?
With a standard spark plug socket, most owners find the process quick and simple.