NGK BUZ8H Spark Plug, Stock Number 7447, for Mercury I/O and Evinrude/Johnson Outboards

The NGK BUZ8H is a standard nickel spark plug built for Mercury sterndrive engines and Evinrude and Johnson outboard engines that call for this specific plug. It uses a solid copper core center electrode for strong heat dissipation and conductivity across a broad heat range, paired with a nickel center electrode tip and a nickel ground electrode. The plug is configured with surface discharge ground firing and carries a 35 ohm resistance value. NGK treats the plug with corrosion-resistant plating so it threads in and out cleanly during installation and future servicing, reducing the risk of thread damage on aluminum cylinder heads common to marine engines.

This plug is identified by NGK stock number 7447 and manufacturer part number BUZ8H. It is designed to fit Mercury I/O (inboard/outboard, sterndrive) engines from 2006 to 1997, Evinrude outboard engines from 1987 to 1977, Johnson outboard engines from 1992 to 1976, and Mercury outboard engines from 2002 to 1987. Because ignition components are engine-specific, always confirm the plug called for in your engine's maintenance manual or original equipment specification before ordering, since installing the wrong heat range or resistance value can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: BUZ8H
• Stock Number: 7447
• Resistance: 35 ohm
• Ground Configuration: Surface Discharge
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• UPC: 087295174470
• Weight: 0.15 pounds
• OEM Equivalent Part Number: 14103568

Fitment

• I/O (sterndrive): Mercury, 2006-1997
• Outboard: Evinrude, 1987-1977
• Outboard: Johnson, 1992-1976
• Outboard: Mercury, 2002-1987

Replaces (OEM)

• 14103568

Frequently Asked Questions

What engines does the NGK BUZ8H (stock number 7447) fit? This plug fits Mercury I/O sterndrive engines from 2006 to 1997, Evinrude outboard engines from 1987 to 1977, Johnson outboard engines from 1992 to 1976, and Mercury outboard engines from 2002 to 1987.

Is BUZ8H the correct part number to search for? Yes, BUZ8H is the manufacturer part number for this NGK plug, also cataloged under NGK stock number 7447.

What is the resistance value of the NGK BUZ8H spark plug? The NGK BUZ8H has a resistance of 35 ohm.

What ground electrode configuration does this plug use? The BUZ8H uses a surface discharge ground configuration with a nickel ground electrode.

What materials are the electrodes made of? The center electrode has a copper core with a nickel tip, and the ground electrode core material is nickel.

How much does the NGK 7447 spark plug weigh? This spark plug weighs 0.15 pounds.

Is there an OEM equivalent number for the BUZ8H? Yes, the OEM equivalent part number for the NGK BUZ8H is 14103568.

Will this plug fit both inboard/outboard and outboard engines? The NGK BUZ8H covers both applications: it fits Mercury I/O (sterndrive) engines from 2006-1997 and outboard engines from Evinrude, Johnson, and Mercury within the listed year ranges.

Does the BUZ8H require any special installation care? The plug is corrosion-resistant plated for easier installation and removal, but the correct torque and thread care for your specific marine engine should still be followed.

What happens if I install the wrong spark plug in my marine engine? Using an incorrect plug in place of the NGK BUZ8H can reduce optimum engine performance, lower fuel economy, or cause engine damage, so always confirm fitment against your engine's maintenance manual first.

Is this a platinum or iridium spark plug? No, the BUZ8H is a standard nickel-design plug with a copper core, not a platinum or iridium plug.