NGK Spark Plug LFR6A-11

The NGK LFR6A-11 Spark Plug is a genuine NGK V-Power resistor spark plug, also referenced by stock number 3672. It is designed to deliver reliable ignition performance with NGK’s V-groove center electrode design and is used across selected marine, automotive, and small-engine applications where the exact plug specification is required.

Key Features

• Genuine NGK LFR6A-11 spark plug
• NGK stock number 3672
• V-Power design for improved ignitability
• Resistor plug design
• Supportable specification references show 14 mm thread diameter, 1.25 mm thread pitch, 16 mm (5/8″) hex, 1.1 mm (.044″) gap, and heat range 6

Engine Compatibility

Used in selected marine, automotive, and small-engine applications. Exact compatibility depends on the engine manufacturer’s required spark plug specification, so this plug should be matched by application, engine model, and engine serial number where applicable.

Serial Number Fitment Notice

Spark plug fitment can vary by engine family, year, cylinder-head design, and ignition specification. Always confirm compatibility by engine model, serial number, and the manufacturer’s recommended spark plug reference before ordering.

When This Part Needs Replacement

Replace this spark plug during scheduled tune-up intervals, when misfire symptoms appear, when starting becomes harder than normal, or when inspection shows fouling, worn electrodes, or inconsistent spark performance.

Installation Notes

Install only after confirming the correct plug specification for the application. Supportable references show this plug uses a gasket seat and a 1.1 mm preset gap, so the replacement should be checked against the engine manufacturer’s service requirement before installation.

Alternate/Superseded Part Numbers

Current references identify this plug as LFR6A-11, with NGK stock number 3672. Shop-pack references also show NGK 1119 for the same plug designation in bulk packaging.

Parts Desk Insight

Spark plugs are easy to overlook, but the exact plug code matters. Thread reach, heat range, seat style, and preset gap all need to match the engine’s requirement, and using the correct plug is one of the simplest ways to protect starting performance, idle quality, and reliable ignition under load.

Shipping: Ships same or next day for fast Canada wide shipping.