NGK 4462 Laser Iridium Spark Plug IZFR6J, Replaces Quicksilver/Mercury 33-843220Q

The NGK 4462 is a Laser Iridium spark plug (NGK part number IZFR6J) built for engines that call for an iridium-tipped, high-durability plug. Its center electrode uses an iridium tip that NGK rates as six times harder than platinum, giving it a significantly longer service life than a standard copper-tip plug. Supporting that tip is a 98% pure copper core and a high-grade pure alumina ceramic insulator, a combination engineered to prevent the plug from overheating while delivering reliable starts. The ground electrode uses a Standard Ground configuration with a nickel core, and the plug carries a resistance rating of 5000 ohms.

NGK Laser Iridium plugs are tested to NGK's own quality and durability standards and are sold as an actual OE or equivalent replacement, not a generic substitute. The NGK 4462 is suitable for automotive, motorcycle, and marine engines. As with any spark plug, always check your engine's maintenance manual and use only the plug recommended by your engine's original equipment manufacturer; installing the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 4462
• NGK Type Number: IZFR6J
• Resistance: 5000 ohms
• Ground Configuration: Standard Ground
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Iridium
• Weight: 0.15 pounds
• UPC: 087295176511

Replaces (OEM)

• Quicksilver / Mercury 33-843220Q

Frequently Asked Questions

What is the difference between the NGK 4462 and a standard copper spark plug? The NGK 4462 (IZFR6J) uses an iridium-tipped center electrode that NGK rates as six times harder than platinum, giving it longer service life than a standard copper-tip plug, while its 98% pure copper core still handles heat dissipation.

Does the NGK 4462 replace the Quicksilver/Mercury 33-843220Q spark plug? Yes, the NGK 4462 spark plug (NGK part number IZFR6J) is listed as a replacement for Quicksilver/Mercury part number 33-843220Q.

What is the electrical resistance rating of the NGK 4462 spark plug? 5000 ohms is the resistance rating of the NGK 4462 Laser Iridium spark plug.

What materials are used in the NGK 4462 spark plug's electrodes? The NGK 4462 has a copper-core center electrode with an iridium tip, paired with a nickel-core ground electrode in a Standard Ground configuration.

How much does the NGK 4462 spark plug weigh? 0.15 pounds is the weight of the NGK 4462 Laser Iridium spark plug.

Is the NGK 4462 a genuine NGK part or an aftermarket equivalent? It is a genuine NGK Laser Iridium spark plug, sold under NGK's own designation IZFR6J (stock number 4462), and is tested to NGK's quality and durability standards as an actual OE or equivalent replacement.

What ground electrode configuration does the NGK 4462 use? Standard Ground configuration is used on the NGK 4462 Laser Iridium spark plug, with a nickel-core ground electrode.

Can the NGK 4462 be used in automotive, motorcycle, and marine engines? Yes, the NGK 4462 (IZFR6J) Laser Iridium spark plug is built for use in automotive, motorcycle, and marine engines, provided it matches your engine manufacturer's specified plug.

How do I know if the NGK 4462 is the correct spark plug for my engine? Check your engine's maintenance manual for the correct spark plug specification; the NGK 4462 is an OE or equivalent replacement, and using the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

What is the UPC for the NGK 4462 spark plug? 087295176511 is the UPC assigned to the NGK 4462 (IZFR6J) Laser Iridium spark plug.

Why choose an iridium spark plug like the NGK 4462 over a nickel or copper-tip plug? The iridium center electrode tip on the NGK 4462 resists wear far better than nickel or copper tips, and its high-grade alumina ceramic insulator with a 98% pure copper core helps prevent overheating for reliable starts.