Osculati 47.558.83 – NGK BPR5EFS Marine Spark Plug
The NGK BPR5EFS (Osculati 47.558.83) is a warm-range, long-reach spark plug with a built-in resistor and a projected insulator tip. It is specifically designed for modern marine engines requiring clean, stable ignition at low and mid-range RPMs, and is ideal for 4-stroke or EFI 2-stroke engines with electronic ignition systems. The resistor suppresses electromagnetic interference, while the projected insulator improves fuel burn and cold-start reliability.
Key Features:
- Warm heat range (5) ideal for general-purpose marine operation
- Resistor type for reduced electromagnetic interference (EMI)
- 19 mm reach with M14 × 1.25 mm thread for deeper combustion chambers
- Projected insulator tip improves spark exposure and combustion efficiency
- Nickel alloy construction for high corrosion resistance in marine use
Technical Specifications:
| Attribute | Value |
|---|---|
| Model | NGK BPR5EFS |
| Osculati Code | 47.558.83 |
| Thread Diameter | M14 × 1.25 mm |
| Reach | 19 mm |
| Hex Size | 16 mm |
| Heat Range | 5 (warm) |
| Gap | 0.8 mm |
| Electrode Type | Standard with projected tip |
| Resistor | Yes |
Manufacturer Compatibility:
- Yamaha
- Mercury
- Mariner
- Honda
- Suzuki
- Tohatsu
- Selva
Cross Reference:
| Brand | Model |
|---|---|
| NGK | BPR5EFS |
| Champion | – |
The NGK BPR5EFS is a versatile marine spark plug designed for reliable cold starts and smooth operation in outboards using modern ignition control modules. Its balance of heat dissipation and spark focus makes it ideal for recreational boats, inflatables, and compact cruisers operating in salt or fresh water.
