NGK YR5 V-Power Spark Plug, Part Number 7052 - Fits Berkeley, Flagship, Hardin, and OMC I/O Marine Engines

The NGK YR5 V-Power spark plug, part number 7052, is a resistor-type spark plug built to NGK's OE-tested standards for marine I/O drives and GM-based marine engines. It uses a V-cut center electrode paired with a concave ground electrode to increase ignitability and deliver more complete combustion compared to a standard nickel plug. The center electrode has a copper core with a nickel tip for strong heat dissipation and reliable starts, while the ceramic insulator provides consistent heat resistance during operation. Trivalent metal plating on the shell eliminates the need to apply anti-seize compound before installation, and cold-rolled threads help prevent cross-threading into the cylinder head.

The NGK YR5 (7052) is built with a 5000 ohm resistor design for ignition interference suppression and a standard ground electrode configuration. It is intended for marine I/O applications including Berkeley, Flagship, Hardin, and OMC drives, as well as GM-based Buick, Chevrolet, GMC, and Pontiac engines used in marine and industrial service, plus farm tractors and lift trucks that share the same ignition specification. Always confirm the correct plug against your engine's maintenance manual before ordering, since using the wrong spark plug can reduce performance and fuel economy or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 7052
• Spark Plug Type: YR5
• UPC: 087295170526
• Resistance: 5000 ohm
• Ground Electrode Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Insulator Material: Ceramic (alumina silicate)
• Anti-Seize Required: No, trivalent plating eliminates the need
• Package Quantity: 1 spark plug
• Weight: 0.15 pounds

Fitment

• Buick, model years 1974-73
• Chevrolet, model years 1990-70
• GMC, model years 1989-70
• Pontiac, model year 1972
• Berkeley I/O drives, 1990-76
• Flagship I/O drives, 1977-75
• Hardin I/O drives, 1990-74
• OMC I/O drives, 1985-82
• Farm equipment: Allis-Chalmers, John Deere, Massey-Ferguson, New Idea
• Lift trucks: Hyster

Frequently Asked Questions

What part number is this spark plug? This is NGK part number 7052, an NGK V-Power plug of type YR5.

What marine I/O drives does the NGK YR5 (7052) fit? The NGK YR5, part number 7052, fits Berkeley I/O drives from 1990-76, Flagship I/O drives from 1977-75, Hardin I/O drives from 1990-74, and OMC I/O drives from 1985-82.

Does the NGK 7052 fit automotive-based marine engines too? Yes, the NGK YR5 (7052) also covers Buick engines from 1974-73, Chevrolet from 1990-70, GMC from 1989-70, and Pontiac from 1972.

Do I need to apply anti-seize compound before installing this plug? No. The NGK YR5 (7052) has trivalent metal plating that eliminates the need for anti-seize compound.

What is the electrical resistance of this spark plug? The NGK YR5 (7052) has a resistance of 5000 ohm, used for ignition interference suppression.

What is the center electrode made of on the NGK YR5? It has a copper-core center electrode with a nickel tip, paired with a nickel ground electrode.

How much does the NGK 7052 spark plug weigh? This spark plug weighs 0.15 pounds.

Will this spark plug work in farm equipment? Yes, the NGK YR5 (7052) fits Allis-Chalmers, John Deere, Massey-Ferguson, and New Idea farm equipment, as well as Hyster lift trucks.

How many spark plugs are included when I order the NGK 7052? One NGK YR5 spark plug (part number 7052) is included per unit.

What is the UPC for the NGK YR5 spark plug? The UPC for the NGK YR5, part number 7052, is 087295170526.

Is the NGK 7052 a genuine NGK part or an aftermarket copy? The 7052 is a genuine NGK V-Power YR5 spark plug, not an aftermarket substitute.

What design features improve ignitability on this plug? A V-cut center electrode and concave ground electrode on the NGK YR5 (7052) increase ignitability compared to a standard nickel plug.