NGK 4122 (BR7HS) Standard Spark Plug for Evinrude, Johnson and Yamaha Outboards

The NGK 4122 is a standard nickel spark plug identified by the plug code BR7HS, built for reliable ignition performance across a wide range of small and marine engines. It uses a solid copper core center electrode for strong heat dissipation and conductivity, paired with a nickel center electrode tip and a standard nickel ground electrode for consistent, everyday performance. The insulator is a high-grade ceramic construction that resists flashover and helps prevent cross-threading during installation and removal.

This spark plug is treated with a corrosion-resistant plating that keeps the threads turning smoothly during service, reducing the risk of seizing in the cylinder head over time. With an electrical resistance of 5000 ohms and a standard ground configuration, the NGK 4122 (BR7HS) is designed as a straightforward, OE-style replacement plug rather than a performance or racing plug.

The NGK 4122 (BR7HS) is used across outboard motors, personal watercraft, motorcycles, and small power equipment engines. On the marine side, it fits a range of Evinrude, Johnson, and Yamaha outboards, along with Yamaha personal watercraft and Yamaha water pump engines, making it a common maintenance item for boat owners replacing worn plugs as part of routine engine service.

Specifications

• Brand: NGK
• Manufacturer Part Number: 4122
• NGK Plug Code: BR7HS
• Ground Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Insulator Material: Ceramic
• Resistance: 5000 ohms
• Thread Size: 14mm
• Weight: 0.15 pounds
• UPC: 087295141229
• Quantity: 1 spark plug

Fitment

• Outboard: Evinrude (1977-2003), Johnson (1978-2006), Suzuki Spirit (1976-1981), Yamaha (1996-2004)
• Personal Watercraft: Yamaha (1997-2001)
• Motorcycle: Aprilia (1993-2005), Honda (1991-1996), Husqvarna (1999-2003), Yamaha (1991-2001)
• Power Equipment: Kohler engines, Solo lawnmowers, Yamaha water pumps

Frequently Asked Questions

What engines does the NGK 4122 spark plug fit? The NGK 4122, also identified by the plug code BR7HS, fits Evinrude outboards from 1977-2003, Johnson outboards from 1978-2006, Yamaha outboards from 1996-2004, Suzuki Spirit outboards from 1976-1981, and Yamaha personal watercraft from 1997-2001, along with a range of motorcycles and power equipment engines.

Is the NGK 4122 the same as the BR7HS plug? Yes, 4122 and BR7HS refer to the same NGK standard spark plug; 4122 is the part number used to identify it and BR7HS is the plug's designation.

What is the electrical resistance of this spark plug? The NGK 4122 (BR7HS) has a resistance of 5000 ohms.

What material is the center electrode made of? A solid copper core makes up the center electrode, which is capped with a nickel tip for durability and heat resistance.

Does this spark plug fit personal watercraft? Yes, the NGK 4122 (BR7HS) fits Yamaha personal watercraft models from 1997-2001.

How much does the NGK 4122 spark plug weigh? The NGK 4122 (BR7HS) spark plug weighs 0.15 pounds.

What thread size does the NGK 4122 use? This spark plug has a 14mm thread size.

Is this a resistor or standard spark plug? The NGK 4122 (BR7HS) is a standard ground configuration spark plug, not a projected-tip or racing plug.

How many spark plugs come in the package? The NGK 4122 (BR7HS) ships as a single spark plug.

Will this plug work on a Yamaha water pump engine? Yes, the NGK 4122 (BR7HS) is listed as fitting Yamaha water pump engines.

Does the NGK 4122 have corrosion protection? Yes, the plug is treated with corrosion-resistant plating that eases installation and removal over the life of the engine.

What is the insulator made of on the NGK 4122? The NGK 4122 (BR7HS) uses a ceramic insulator for heat resistance and electrical insulation.