NGK 5887 Laser Iridium Spark Plug IZFR5G - Replaces Mercury 33-889597Q

The NGK 5887 is a Laser Iridium spark plug (NGK part number IZFR5G) engineered as an actual OE or equivalent replacement plug for marine engines. The iridium-tipped center electrode delivers durability that is six times harder than platinum, helping the plug resist wear over long service life. NGK builds the insulator from high-grade pure alumina ceramic paired with a 98% pure copper core, a combination that prevents the plug from overheating while supporting reliable starts in demanding marine use.

Each Laser Iridium plug is tested to NGK's quality and durability standards before it ships. The NGK 5887 uses a standard ground electrode configuration with a nickel ground electrode core and a copper center electrode core beneath the iridium tip, and it carries a resistance rating of 5000 ohms. The plug is manufactured in Japan and ships one per package. Always check your engine and maintenance manual for the correct spark plug, and use only the plug recommended by your engine's original equipment manufacturer -- using the wrong plug can reduce optimum performance, reduce fuel economy, or cause engine damage.

Specifications

• Brand: NGK
• Manufacturer Part Number: 5887
• NGK Part Designation: IZFR5G
• Type: Laser Iridium Spark Plug
• Resistance: 5000 ohms
• Ground Configuration: Standard Ground
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Iridium
• Insulator Material: Pure Alumina Ceramic
• Package Quantity: 1
• Country of Origin: Japan
• Product Dimensions: 0.31 x 0.39 x 1.26 inches
• Weight: 0.15 pounds

Replaces (OEM)

• Quicksilver / Mercury 33-889597Q

Frequently Asked Questions

What does the NGK 5887 spark plug replace? The NGK 5887 (IZFR5G) directly replaces Quicksilver/Mercury spark plug 33-889597Q.

Is the NGK 5887 spark plug genuine OEM or aftermarket? NGK produces the 5887 (IZFR5G) as an actual OE or equivalent replacement spark plug, tested to NGK's quality and durability standards.

What is the center electrode tip made of on the NGK 5887? Iridium is the center electrode tip material on the NGK 5887 spark plug, offering durability six times harder than platinum.

How many spark plugs are included when I order the NGK 5887? One NGK 5887 spark plug ships per package.

What is the resistance rating of the NGK 5887 spark plug? 5000 ohms is the resistance rating of the NGK 5887 (IZFR5G) spark plug.

How much does the NGK 5887 spark plug weigh? The NGK 5887 spark plug weighs 0.15 pounds.

What ground electrode configuration does the NGK 5887 use? The NGK 5887 spark plug uses a standard ground electrode configuration.

Where is the NGK 5887 spark plug manufactured? Japan is the country of origin for the NGK 5887 (IZFR5G) spark plug.

What are the physical dimensions of the NGK 5887 spark plug? The NGK 5887 spark plug measures 0.31 x 0.39 x 1.26 inches.

How does the NGK 5887 Laser Iridium plug differ from NGK's standard spark plugs? NGK's Laser Iridium plugs, including the 5887 (IZFR5G), use an iridium-tipped center electrode for durability six times harder than platinum, while NGK's standard spark plugs use a nickel center electrode tip with corrosion-resistant plating.

What core materials are used inside the NGK 5887 spark plug? The NGK 5887 uses a nickel ground electrode core and a copper center electrode core, both housed in a pure alumina ceramic insulator with a 98% pure copper core.

How do I confirm the NGK 5887 is the correct spark plug for my engine? Check your engine and maintenance manual for the correct spark plug and only use the plug recommended by your engine's original equipment manufacturer before installing the NGK 5887, since using the wrong plug can reduce performance, reduce fuel economy, or cause engine damage.