Osculati 47.558.38 – NGK LFR5A-11 Marine Spark Plug
The NGK LFR5A-11 (Osculati 47.558.38) spark plug is purpose-built for high-performance 4-stroke marine engines. It features a projected insulator nose for better combustion and fouling resistance, and an integrated resistor to suppress electromagnetic interference. The 1.1 mm wide gap is optimized for engines requiring a stronger ignition spark, improving efficiency and cold-start reliability.
Key Features:
- Resistor-type spark plug (R) – reduces EMI for marine electronics
- 1.1 mm factory-set wide gap for high-efficiency combustion
- Projected insulator tip minimizes fouling
- Solid copper core for optimal conductivity and heat dissipation
- Ideal for high-RPM, 4-stroke marine engines
Technical Specifications:
| Attribute | Value |
|---|---|
| Model | NGK LFR5A-11 |
| Osculati Code | 47.558.38 |
| Thread Diameter | M14 × 1.25 mm |
| Reach | 19 mm |
| Hex Size | 16 mm |
| Heat Range | 5 |
| Gap | 1.1 mm |
| Electrode Type | Standard with projected tip |
| Resistor | Yes |
Manufacturer Compatibility:
- Yamaha
- Mercury
- Mariner
- Suzuki
- Tohatsu
- Selva
- Honda
Cross Reference:
| Brand | Model |
|---|---|
| NGK | LFR5A-11 |
| Champion | – |
The NGK LFR5A-11 spark plug is widely used in modern 4-stroke outboards requiring precise combustion control and minimal electrical noise. Its extended reach and wide gap are suited for high-compression engines that demand consistent ignition even under heavy marine operating conditions.
