NGK V-Power Spark Plug - LFR5A-11
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The NGK LFR5A-11 is a V-Power nickel spark plug used in select marine four-stroke outboards, personal watercraft, small engines, and automotive applications where the engine manufacturer specifies this exact plug number. NGK stock number 6376 features a long-reach 14 mm shell, projected-style firing end, and factory-set 1.1 mm / 0.044 in. gap as indicated by the "-11" suffix.
This plug should be installed only where the engine service manual, ignition label, or parts chart specifically calls for NGK LFR5A-11 / 6376.
Key Features
- Genuine NGK V-Power spark plug.
- NGK part number: LFR5A-11.
- NGK stock number: 6376.
- V-groove center electrode design to help position the spark at the electrode edge.
- Nickel-alloy firing-end construction for standard service applications.
- Thread size: 14 mm.
- Thread reach: 26.5 mm.
- Hex size: 5/8 in. / 16 mm.
- Heat range: 5.
- Factory preset gap: 0.044 in. / 1.1 mm.
- Commonly used in select Yamaha and Mercury four-stroke outboard applications where specified.
Application Compatibility
Common marine application context includes select four-stroke outboards where the factory service chart calls for NGK LFR5A-11, including:
- Select Yamaha FourStroke outboards where specified
- Select Yamaha F75 / F90 / F115 / F150 application groups where the service chart calls for this plug
- Select Mercury FourStroke outboards where specified
- Select 75 HP through 150 HP four-stroke marine applications where the factory plug chart calls for LFR5A-11
- Select automotive and powersport applications that specify NGK LFR5A-11 / 6376
Use this spark plug only where the engine manufacturer's plug chart specifically lists LFR5A-11 or an approved equivalent.
Fitment Notice
Confirm fitment by engine model, model year, serial number, service manual, and factory spark plug chart before ordering. Spark plugs with the same thread size can still differ in reach, heat range, projected tip design, electrode style, resistor specification, and required gap. Installing the wrong plug can cause misfire, hard starting, poor idle, piston contact, thread damage, overheating, or ignition-system issues.
When This Part Needs Replacement
Replace spark plugs during scheduled tune-up service or whenever plugs are fouled, worn, fuel-soaked, oil-contaminated, damaged, corroded, or causing hard starting, rough idle, hesitation, misfire, poor acceleration, or reduced top-end performance. Marine engines that idle frequently, troll for long periods, or operate in humid/salt environments may require more frequent inspection.
Installation Notes
Check the plug number against the engine service chart before installation. Inspect the plug gap and adjust only if the engine manufacturer requires a different setting. Install into clean, undamaged cylinder head threads and tighten to the engine manufacturer's torque specification. Avoid over-tightening in aluminum cylinder heads. Apply anti-seize only if the engine or spark plug manufacturer's service procedure calls for it, as added lubricant can change torque loading.
Alternate/Superseded Part Numbers
- NGK LFR5A-11 — plug part number
- NGK 6376 — stock number
- LFR5A11 — alternate catalog formatting
- LFR5A-11 V-Power — product style reference
Parts Desk Insight
Spark plug fitment should always be matched by the exact plug number and engine service chart, not just by horsepower or thread size. The LFR5A-11 is a long-reach plug with a specific heat range and factory gap, so it should not be substituted with a similar-looking 14 mm plug unless the manufacturer's chart confirms the replacement.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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