Osculati 47.558.37 – NGK BR5HS Marine Spark Plug
The NGK BR5HS (Osculati 47.558.37) is a resistor spark plug specifically designed for marine 2-stroke outboard engines. With a short 12.7 mm reach and a heat range of 5, it provides reliable cold starts and clean combustion under variable load conditions. Its compact dimensions make it perfect for small displacement engines where space is limited, and its internal resistor helps eliminate electromagnetic interference (EMI) with marine electronics.
Key Features:
- Resistor-type for reduced EMI interference
- Short 12.7 mm reach for shallow cylinder heads
- Nickel alloy electrode for marine durability
- Optimized for low-to-mid temperature combustion (heat range 5)
- Ideal for compact 2-stroke outboard engines
Technical Specifications:
| Attribute | Value |
|---|---|
| Model | NGK BR5HS |
| Osculati Code | 47.558.37 |
| Thread Diameter | M14 × 1.25 mm |
| Reach | 12.7 mm |
| Hex Size | 20.8 mm |
| Heat Range | 5 |
| Gap | 0.7 – 0.8 mm |
| Electrode Type | Standard |
| Resistor | Yes |
Manufacturer Compatibility:
- Yamaha
- Mercury
- Mariner
- Suzuki
- Tohatsu
- Selva
- Honda
Cross Reference:
| Brand | Model |
|---|---|
| NGK | BR5HS |
| Champion | L90C |
The NGK BR5HS is a go-to spark plug for service technicians working with lightweight, small-bore 2-stroke outboards. Its compact size, resistor design, and optimized heat range ensure reliable ignition and spark stability in varying marine conditions.
