NGK 3710 Spark Plug (B7S) - Copper Core, Fits Mercury Outboard 1966-1960

The NGK 3710 is a standard NGK spark plug (NGK model designation B7S) built on NGK's proven copper-core design. It uses a solid copper core center electrode for strong heat dissipation and conductivity across a broad heat range, paired with a nickel center electrode tip and nickel ground electrode in a standard ground configuration. The plug shell is treated with corrosion-resistant plating, which keeps the threads turning freely for easy installation and removal even after extended service.

This is a resistor-style plug rated at 1 Ohm of resistance, which helps suppress ignition noise. The insulator is ceramic and the thread is sized M14 x 1.25. NGK Standard plugs like the 3710 are positioned as an OE-cornerstone design, meaning they replicate the specification and performance NGK has supplied to original equipment manufacturers for decades.

Fitment for the NGK 3710 (B7S) spans outboard, power equipment, and industrial applications: Mercury outboard motors (1966-1960), Briggs & Stratton, Kohler, and Kubota power equipment engines, Bolens and Poulan Pro chainsaws, Onan and Tanaka generators, Wood Pro and Tanaka blowers, H.M.C. String trimmers, and commercial/industrial engines from Hall Scott, Subaru-Robin, and Waukesha, as well as Tohatsu farm engines. Always confirm the correct spark plug against your engine's maintenance manual before ordering, since using the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 3710
• NGK Plug Designation: B7S
• Resistance: 1 Ohm
• Ground Electrode Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Insulator Material: Ceramic
• Thread Size: M14 x 1.25
• Quantity: 1 spark plug
• UPC: 087295137109
• Weight: 0.15 pounds

Fitment

• Mercury outboard motors, 1966-1960
• Briggs & Stratton power equipment engines
• Kohler power equipment engines
• Kubota power equipment engines
• Bolens chainsaws
• Poulan Pro chainsaws
• Onan generators
• Tanaka generators and blowers
• Wood Pro blowers
• H.M.C. String trimmers
• Hall Scott commercial/industrial engines
• Subaru-Robin commercial/industrial engines
• Waukesha commercial/industrial engines
• Tohatsu farm engines

Replaces (OEM)

No additional OEM cross-reference numbers are listed for the NGK 3710 (B7S) beyond its own NGK part number. Always verify against your engine's maintenance manual.

Frequently Asked Questions

What engines does the NGK 3710 spark plug fit? The NGK 3710 (NGK model B7S) fits Mercury outboard motors from 1966-1960, along with Briggs & Stratton, Kohler, and Kubota power equipment engines, Bolens and Poulan Pro chainsaws, Onan and Tanaka generators, Wood Pro and Tanaka blowers, H.M.C. String trimmers, Hall Scott, Subaru-Robin, and Waukesha commercial/industrial engines, and Tohatsu farm engines.

Is the NGK 3710 the same plug as the NGK B7S? Yes, 3710 is the part number for the NGK B7S standard spark plug; both refer to the same plug.

What is the thread size on this spark plug? The NGK 3710 uses an M14 x 1.25 thread size.

Is this a resistor spark plug? Yes, the NGK 3710 is rated at 1 Ohm of resistance, which is a resistor-type plug that helps suppress ignition noise.

What materials are used in the electrodes? The NGK 3710 has a copper center electrode core with a nickel center electrode tip, and a nickel ground electrode in a standard ground configuration.

Does the NGK 3710 fit 1966-1960 Mercury outboards specifically? Yes, Mercury outboard motors from the 1966-1960 range are a listed fitment for the NGK 3710 spark plug.

How many spark plugs come in this listing? This listing is for one NGK 3710 (B7S) spark plug.

What is the insulator material on the NGK 3710? The insulator on the NGK 3710 spark plug is ceramic.

How much does the NGK 3710 spark plug weigh? The NGK 3710 spark plug weighs 0.15 pounds.

Are there OEM cross-reference numbers for the NGK 3710? No additional OEM cross-reference numbers are listed for the NGK 3710 (B7S); it is identified by its own NGK part number.

Why does corrosion-resistant plating matter on a spark plug? The corrosion-resistant plating on the NGK 3710 shell keeps the threads from seizing, which makes the plug easier to install and remove during future maintenance.

Should I confirm fitment before ordering the NGK 3710? Yes, check your engine's maintenance manual against the NGK 3710 (B7S) fitment list before ordering, since the wrong spark plug can reduce performance, hurt fuel economy, or damage the engine.