NGK Spark Plug 5126 (B8HS-10) - Copper Core, Nickel Electrode, 14mm Thread

The NGK 5126 is a standard nickel spark plug built for reliable ignition performance in marine and small-engine applications. Identified by NGK as model B8HS-10, it uses a solid copper core center electrode for efficient heat dissipation and consistent conductivity, paired with a nickel center electrode tip and a nickel standard ground electrode for durable, long-lasting operation. The plug carries a resistance rating of 1 Ohm and a 14 millimeter thread, and it is treated with corrosion-resistant plating that makes installation and removal straightforward.

This spark plug is engineered as a direct interchange for engines originally fitted with Johnson/Evinrude part number 0503705 or Yamaha part number B8H-S1000-00-00, making it a straightforward replacement option when servicing compatible outboard engines. Each unit ships individually and is ready to install as a routine maintenance or replacement part. As with any spark plug swap, confirm the correct heat range and thread specification against your engine's original equipment manufacturer maintenance manual before installing, since using an incorrect plug can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 5126
• Model Number: B8HS-10
• Resistance: 1 Ohm
• Ground Electrode Tip Design: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Thread Size: 14 millimeters
• Package Dimensions: 3.89 inches L x 0.94 inches W x 0.66 inches H
• Weight: 0.15 pounds
• UPC: 087295151266

Replaces (OEM)

• Johnson/Evinrude 0503705
• Yamaha B8H-S1000-00-00

Frequently Asked Questions

What is the NGK 5126 spark plug? The NGK 5126 is a standard nickel spark plug, also identified by NGK as model B8HS-10, featuring a copper core center electrode and a nickel ground and center electrode tip.

Does the NGK 5126 cross-reference to a Johnson or Evinrude part number? Yes, the NGK 5126 (B8HS-10) is interchangeable with Johnson/Evinrude part number 0503705.

Is there a Yamaha equivalent to the NGK 5126 spark plug? Yes, the NGK 5126 (B8HS-10) is interchangeable with Yamaha part number B8H-S1000-00-00.

What thread size does the NGK B8HS-10 spark plug use? The NGK B8HS-10, sold as part number 5126, has a 14 millimeter thread size.

What is the electrical resistance rating of this spark plug? The NGK 5126 spark plug has a resistance rating of 1 Ohm.

What materials are used in the NGK 5126 spark plug's electrodes? The center electrode core is copper for efficient heat dissipation, while the center electrode tip and the standard ground electrode are nickel.

How much does the NGK 5126 spark plug weigh? The NGK 5126 spark plug weighs 0.15 pounds.

What are the package dimensions of the NGK 5126 spark plug? The NGK 5126 ships in packaging measuring 3.89 inches long by 0.94 inches wide by 0.66 inches high.

Is the NGK 5126 an OE-style or aftermarket-only spark plug? The NGK 5126 (B8HS-10) is a standard NGK plug built to OE-style specifications, corrosion-resistant plated for reliable installation and removal.

How many spark plugs come in one NGK 5126 package? The NGK 5126 spark plug is packaged and sold as a single unit.

What ground electrode configuration does the NGK 5126 use? The NGK 5126 (B8HS-10) uses a standard ground electrode configuration with a nickel core material.

How do I know if the NGK 5126 is the right replacement plug for my engine? Confirm the correct heat range and thread specification against your engine's original equipment manufacturer maintenance manual before installing the NGK 5126, since the wrong plug can reduce performance or damage the engine.