NGK B7HS Standard Spark Plug - Fits Outboard, Sterndrive and PWC Engines

The NGK B7HS is a Standard spark plug built on NGK's proven OE plug design, used across a wide range of outboard, sterndrive, personal watercraft, and other small-engine applications. It uses a solid copper core for superior heat dissipation and conductivity, paired with a broad heat range for consistent, reliable ignition performance. The plug is treated with corrosion-resistant plating on the shell and threads, which keeps installation and future removal easier over the life of the plug and helps prevent seizing in the cylinder head.

Electrode construction is nickel on both the ground and center electrode tip, with a copper core running through the center electrode for efficient heat transfer away from the firing tip. The plug carries a Standard ground electrode configuration and measures 1 ohm of resistance. NGK Standard plugs like the B7HS are positioned as an OE-cornerstone design, meaning they replicate the fit, heat range, and performance characteristics engine manufacturers originally specified.

Fitment covers Subaru engines (1970-68), ATV applications from ATK, various motorcycle applications, PWC applications including Surf Jet and Yamaha, snowmobile applications from Moto-Ski and Ski-Doo, sterndrive (I/O) applications from Hardin, outboard applications from Evinrude, Force, Johnson, Mariner, Mercury, Sea King, Sears, Suzuki, Tohatsu, and Yamaha, portable engine applications from Kawasaki Outdoor Power, and various commercial/industrial applications. Always confirm the correct spark plug against your engine's maintenance manual before ordering, since using the wrong plug can reduce performance, hurt fuel economy, or cause engine damage.

Specifications

• Brand: NGK
• Manufacturer Part Number: B7HS
• Product Type: Standard Spark Plug
• Resistance: 1 ohm
• Ground Electrode Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Thread Size: 14 millimeters
• Unit Count: 1 spark plug
• UPC: 087295151105
• Weight: 0.15 pounds

Fitment

• Subaru, 1970-68
• ATV - ATK
• Motorcycle - Various
• PWC - Surf Jet, Yamaha
• Snowmobile - Moto-Ski, Ski-Doo
• Sterndrive (I/O) - Hardin
• Outboard - Evinrude, Force, Johnson, Mariner, Mercury, Sea King, Sears, Suzuki, Tohatsu, Yamaha
• Portable Engines - Kawasaki Outdoor Power
• Commercial/Industrial - Various

Frequently Asked Questions

What engines does the NGK B7HS spark plug fit? The NGK B7HS fits Subaru engines (1970-68), ATK ATVs, various motorcycles, Surf Jet and Yamaha PWC, Moto-Ski and Ski-Doo snowmobiles, Hardin sterndrive engines, outboards from Evinrude, Force, Johnson, Mariner, Mercury, Sea King, Sears, Suzuki, Tohatsu, and Yamaha, Kawasaki Outdoor Power portable engines, and various commercial/industrial engines.

Is the B7HS a resistor spark plug? The NGK B7HS has 1 ohm of resistance, which is very low compared to NGK's resistor plugs that run around 5000 ohms, so it functions as a standard (non-resistor) plug rather than a high-resistance suppressor plug.

What is the electrode material on the B7HS? The B7HS uses a nickel ground electrode and a nickel center electrode tip, with a copper core running through the center electrode for heat dissipation and conductivity.

What thread size does the NGK B7HS use? The NGK B7HS spark plug has a 14 millimeter thread size.

How much does the NGK B7HS weigh? The NGK B7HS spark plug weighs 0.15 pounds.

Does the B7HS come with corrosion protection? Yes, the B7HS is treated with corrosion-resistant plating on the shell and threads, which makes installation and future removal easier over the plug's service life.

How many spark plugs come in the package? The NGK B7HS is sold as a single spark plug (unit count of 1).

Is the NGK B7HS an OE-style plug or an aftermarket design? The B7HS is part of NGK's Standard line, described by NGK as an OE-cornerstone design intended to match original equipment fit and performance rather than being a departure from OE specification.

What ground electrode configuration does the B7HS use? The NGK B7HS uses a Standard ground electrode configuration.

Will the B7HS work in my Mercury or Evinrude outboard? The NGK B7HS is listed as fitting Evinrude, Force, Johnson, Mariner, Mercury, Sea King, Sears, Suzuki, Tohatsu, and Yamaha outboard engines, but you should confirm against your engine's maintenance manual before ordering.

What core material gives the B7HS its heat dissipation? The NGK B7HS uses a solid copper core in the center electrode, which NGK states provides superior heat dissipation, conductivity, and broad heat range.