NGK Spark Plug 93961 (LFR6A-11) - Standard Nickel Plug for Mercury 2001-2006 and Yamaha 2000-2005 Outboards

The NGK 93961 is a standard spark plug (NGK designation LFR6A-11) built for reliable marine outboard ignition. It uses NGK's proven standard-plug construction: a solid copper core center electrode for superior heat dissipation and conductivity, a nickel center electrode tip, and a nickel ground electrode in a standard ground configuration. The plug body is treated with corrosion-resistant plating, which keeps threads from seizing in the cylinder head and makes installation and removal easier over the life of the engine. NGK's broad heat range design helps the plug run cool enough to resist fouling at idle while still handling sustained wide-open-throttle load without pre-ignition.

This plug carries an electrical resistance of 5000 ohms, which suppresses ignition noise without robbing spark energy. It is fitted for 2001-2006 Mercury outboards and 2000-2005 Yamaha outboards. Always confirm the plug specified in your engine's maintenance manual before ordering, since using the wrong plug can reduce fuel economy, cut performance, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 93961
• NGK Part Designation: LFR6A-11
• Resistance: 5000 ohms
• Ground Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Weight: 0.15 pounds
• UPC: 087295939611

Fitment

• 2001-2006 Mercury outboards
• 2000-2005 Yamaha outboards

Replaces (OEM)

• Yamaha OEM LFR-6A110-00-00

Frequently Asked Questions

What engines does the NGK 93961 spark plug fit? The NGK 93961 (LFR6A-11) is fitted for 2001-2006 Mercury outboards and 2000-2005 Yamaha outboards. Always check your engine's maintenance manual to confirm this is the correct plug for your specific model before ordering.

Is the NGK 93961 an OEM-equivalent plug? Yes, the NGK 93961 spark plug replaces Yamaha OEM part LFR-6A110-00-00, so it is a direct cross-reference for that Yamaha OEM number.

What is the electrical resistance of this spark plug? The NGK 93961 carries a resistance of 5000 ohms, which helps suppress ignition noise while maintaining spark energy.

What materials are used in the electrodes? The NGK 93961 uses a copper center electrode core with a nickel center electrode tip, and a nickel ground electrode in a standard ground configuration.

How much does the NGK 93961 spark plug weigh? The NGK 93961 weighs 0.15 pounds.

Is this a standard or surface-discharge spark plug? The NGK 93961 uses a standard ground electrode configuration, not a surface-discharge design.

Why does the NGK 93961 have corrosion-resistant plating? The plating on the NGK 93961 resists corrosion so the plug threads stay easy to install and remove throughout the life of the outboard engine, reducing the risk of seizing in the cylinder head.

Can I use the NGK 93961 in a Mercury outboard from outside the 2001-2006 range? The NGK 93961 is specified for 2001-2006 Mercury outboards. For engines outside that range, check your engine's maintenance manual for the recommended NGK plug, since the correct heat range and thread specification can differ by model year.

What core technology does the NGK 93961 use for heat dissipation? The NGK 93961 has a solid copper core in the center electrode, which gives it strong heat dissipation and conductivity along with a broad heat range.

Does the NGK 93961 come with a warranty concern if the wrong plug is used? Using a plug other than the one specified for your engine, including substituting the NGK 93961 where a different plug is called for, can reduce fuel economy, reduce performance, or cause engine damage, so always confirm against your engine's maintenance manual.