NGK LFR5A-11 Spark Plug 6376 for Yamaha F75-F250 & Mercury 75-225HP 4-Stroke
LFR5A-11-NGK
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NGK LFR5A-11 (6376) Spark Plug
Performance Marine Ignition for 4-Stroke Outboards
The NGK LFR5A-11 (Stock No. 6376) is a high-performance V-Power spark plug engineered to deliver superior reliability in marine environments. Featuring NGK's patented V-groove technology, this plug ensures a more consistent spark and better flame kernel development, making it the ideal choice for heavy-duty 4-stroke outboard engines.
Key Features
- β V-Power Design: Improves ignitability and reduces quenching.
- β 98% Pure Copper Core: Efficiently dissipates heat to prevent engine damage.
- β Trivalent Plating: Anti-corrosion and anti-seizing properties; no anti-seize required.
- β Direct OEM Match: Precision-fit for Yamaha and Mercury EFI models.
Technical Specs
| Thread Diameter | 14mm |
| Thread Reach | 26.5mm (1.04") |
| Hex Size | 16mm (5/8") |
| Spark Gap | 1.1mm (0.043") |
| Heat Range | 5 |
| Resistor Type | Yes (5k Ohm) |
Compatibility / Fitment Guide
| Make | Model Range | Notes |
|---|---|---|
| Yamaha 4-Stroke | F75, F80, F90, F100, F115 | Approx 1999 - 2017+ |
| Yamaha 4-Stroke | F150, F200, F225, F250 | V6 Models / 3.3L |
| Mercury / Mariner | 75HP, 90HP, 115HP EFI | 4-Stroke DOHC models |
| Mercury / Mariner | 225HP (V6) EFI | 4-Stroke USA 0T653945+ |
| Selva 4-Stroke | Marlin, KillerWhale | Direct Replacement |
OEM Cross Reference
| Yamaha | LFR-5A110-00-00, 94702-00391, 94709-00391 |
| Mercury | 33-859495, 33-859495Q, 859495Q, 8M0057936 |
| Honda | 9807B-5517W |
| Champion | REC10YC4 |
Questions & Answers
Is this a genuine original part?
Yes, we supply genuine NGK spark plugs. These are the factory-spec ignition components used by major manufacturers like Yamaha and Mercury.
How do I know if it is compatible?
Check the SKU (LFR5A-11) or Stock Number (6376). If your current plug matches either, or if your engine model is listed in our fitment guide, this is the correct part for your engine.
What is the benefit of the V-Power design in marine engines?
The V-cut center electrode directs the spark to the edge of the electrode. This reduces quenching (heat absorption) and ensures a larger, more powerful flame kernel, which is vital for smooth idling and reliable starting in cold or humid marine conditions.
Note: At 4boats.co.uk, we recommend verifying your engine's specific gap requirements in your owner's manual before installation.
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