NGK 4322 BR8HS Standard Spark Plug for Mercury and Mariner Outboards

The NGK 4322 (type BR8HS) is a Standard series spark plug built on NGK's proven copper-core design, engineered to deliver reliable ignition performance across a wide range of outboard, sterndrive, personal watercraft, and powersport engines. At its core is a solid copper center electrode that offers superior heat dissipation and conductivity, paired with a nickel center electrode tip and a standard nickel ground electrode for consistent, durable sparking. The plug carries a rated resistance of 5000 ohms and uses a standard ground electrode configuration rather than a resistor or projected-tip design.

NGK treats the shell of this Standard spark plug with corrosion-resistant plating, which eases installation and removal and helps the plug hold up in the marine environment where corrosion is a constant threat. The broad heat range of the design is intended to keep the plug operating in its ideal temperature window across varying loads and engine conditions, supporting steady combustion and consistent starting.

The NGK 4322 / BR8HS is application-specific to the engines listed by NGK for this part number, including select Mercury and Mariner outboards, Yamaha sterndrive (I/O), outboard, personal watercraft, snowmobile, and motorcycle engines, plus select Suzuki outboards and other listed powersport applications. Always confirm this is the correct plug for your specific engine using your owner's or service manual before installing, since using the wrong spark plug can reduce performance and fuel economy or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 4322
• NGK Type Designation: BR8HS
• UPC: 087295143223
• Application: Mercury Outboard Spark Plug
• Ground Configuration: Standard Ground
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Ground Electrode Core Material: Nickel
• Resistance: 5000 ohms
• Weight: 0.15 pounds
• Package Dimensions: 3.15 inches L x 0.79 inches H x 1.57 inches W
• Country of Origin: China
• Unit Count: 1 spark plug

Fitment

• Outboard (O/B): Mariner 1994-2001; Mercury 1995-2006; Spirit 1977-1981; Suzuki 1980-2000
• Sterndrive (I/O): Yamaha 1996-2005
• Personal Watercraft (PWC): Mastercraft 1995-1997; Yamaha 1990-2005
• Snowmobile: Yamaha 1982-1998
• Motorcycle (M/C): Aprilia 1996-2003; Honda 1982; Yamaha 1998-2001
• ATV: LEM 1997-2004; UTD Motors 2000-2005

Replaces (OEM)

No separate OEM cross-reference numbers apply; NGK 4322 (BR8HS) is the manufacturer part number itself.

Frequently Asked Questions

What is the NGK 4322 spark plug also known as? NGK 4322 is the manufacturer part number for the NGK BR8HS Standard spark plug; both numbers identify the same plug.

What engines does the NGK 4322 (BR8HS) fit? This plug is listed for select Mercury outboards (1995-2006) and Mariner outboards (1994-2001), Yamaha sterndrive engines (1996-2005), Yamaha personal watercraft (1990-2005) and Mastercraft PWC (1995-1997), Yamaha snowmobiles (1982-1998), select Aprilia, Honda, and Yamaha motorcycles, Suzuki outboards (1980-2000), and select LEM and UTD Motors ATVs.

Is the NGK 4322 a resistor spark plug? No, the NGK 4322 (BR8HS) uses a standard ground electrode configuration rated at 5000 ohms of resistance, not a resistor-specific design.

What materials are used in the NGK 4322 spark plug? The center electrode core is solid copper for heat dissipation and conductivity, with a nickel center electrode tip and a nickel standard ground electrode.

How much does the NGK 4322 spark plug weigh? The NGK 4322 weighs 0.15 pounds.

Does the NGK 4322 spark plug resist corrosion? Yes, NGK treats this Standard series plug's shell with corrosion-resistant plating, which also eases installation and removal in marine applications.

How many spark plugs come in a package of the NGK 4322? The NGK 4322 (BR8HS) ships as a single spark plug, one unit count per package.

Where is the NGK 4322 spark plug manufactured? The NGK 4322 spark plug is manufactured in China.

What is the difference between the NGK BR8HS and other NGK Standard plugs like the BR8ES or BR9ES? The BR8HS carries a different heat range and engine fitment list than the BR8ES or BR9ES; each type designation is calibrated for its own specific set of listed engines, so they are not interchangeable simply because the numbers look similar.

Is the NGK 4322 genuine NGK or aftermarket? The NGK 4322 (BR8HS) is a genuine NGK Standard series spark plug, not an aftermarket equivalent.

What are the package dimensions of the NGK 4322 spark plug? The NGK 4322 has package dimensions of 3.15 inches length by 0.79 inches height by 1.57 inches width.

Can I use the NGK 4322 in place of a resistor-type plug? The NGK 4322 (BR8HS) is a standard ground, non-resistor design rated at 5000 ohms; check your engine manual to confirm this configuration is correct for your application before installing.