NGK CR6HS Spark Plug - Stock Number 7023 - Fits Mercury, Mariner and Yamaha Outboards, Honda Motorcycles

The NGK CR6HS spark plug, sold under NGK stock number 7023, is a Standard-line spark plug built for reliable ignition performance in outboard and motorcycle engines. It uses a solid copper core that improves heat dissipation and electrical conductivity across a broad heat range, backed by decades of use as an original-equipment plug design. The plating on the plug is corrosion-resistant, which keeps threads turning smoothly during both installation and future removal, reducing the risk of cross-threading or a seized plug at your next service interval.

This plug uses a standard ground electrode configuration with a nickel ground electrode and a nickel center electrode tip over a copper core, and it carries a 5000 ohm resistor to help suppress ignition interference. Each plug has a 5/8 inch (16mm) thread size and ships one plug per package. It is intended as a direct fit for the engines listed below; always confirm the plug specified in your engine's owner or maintenance manual before installing, since using an incorrect plug can reduce performance and fuel economy or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 7023
• Spark Plug Part Number: CR6HS
• Resistance: 5000 ohm
• Ground Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Insulator Material: Ceramic (alumina silicate)
• Thread Size: 5/8 inch (16mm)
• Quantity: 1 spark plug per package
• Weight: 0.15 pounds

Fitment

• Mercury outboard, model years 2002-1995
• Mariner outboard, model years 2002-1995
• Yamaha outboard, model years 2004-1985
• Honda motorcycle, model years 1987-1985

Replaces (OEM)

No additional OEM cross-reference numbers are listed for this plug. Order by NGK stock number 7023 (spark plug part number CR6HS) to ensure you receive the correct plug.

Frequently Asked Questions

What engines does the NGK CR6HS spark plug (stock number 7023) fit? The NGK CR6HS spark plug, stock number 7023, fits Mercury outboards model years 2002-1995, Mariner outboards model years 2002-1995, Yamaha outboards model years 2004-1985, and Honda motorcycles model years 1987-1985.

Is stock number 7023 the same plug as the CR6HS? Yes, 7023 is the manufacturer part number for the NGK CR6HS spark plug; both numbers refer to the same plug.

What is the thread size of this spark plug? The NGK CR6HS (stock number 7023) has a 5/8 inch (16mm) thread size.

Is the CR6HS a resistor spark plug? Yes, this plug carries a 5000 ohm resistor, which helps suppress ignition interference.

What are the electrodes made of on this plug? The NGK CR6HS spark plug uses a nickel ground electrode and a nickel center electrode tip over a solid copper core.

Do I need to apply anti-seize before installing this plug? No, the trivalent plating on the NGK 7023 spark plug eliminates the need for anti-seize compound.

How many spark plugs are included? Each package of the NGK CR6HS spark plug (stock number 7023) contains 1 spark plug.

How much does this spark plug weigh? The NGK CR6HS spark plug weighs 0.15 pounds.

What insulator material does this plug use? The insulator on the NGK CR6HS spark plug is made of ceramic (alumina silicate) for strength and heat transfer.

Does this plug fit Honda motorcycles as well as marine outboards? Yes, in addition to Mercury, Mariner, and Yamaha outboards, the NGK 7023 (CR6HS) is listed as fitting Honda motorcycles, model years 1987-1985.

Are the threads on this plug treated to prevent cross-threading? Yes, the NGK CR6HS spark plug has cold-rolled threads designed to help prevent cross-threading and damage to the cylinder head during installation.

Is this a genuine NGK part or an aftermarket equivalent? The NGK CR6HS, stock number 7023, is a genuine NGK Standard-line spark plug, not an aftermarket equivalent.