Osculati 47.558.50 – NGK CR5HSB Marine Spark Plug
The NGK CR5HSB (Osculati 47.558.50) is a compact, short-reach spark plug designed specifically for small 4-stroke marine engines. It features a built-in resistor for electromagnetic interference (EMI) suppression and a standard electrode configuration for consistent ignition. The narrow 10 mm thread and 16 mm hex body make it ideal for compact cylinder head designs in small outboards. This plug is particularly well-suited to engines used in lightweight tenders, inflatables, and portable motors.
Key Features:
- Resistor-type design to reduce RFI and EMI
- Short 12.7 mm reach for compact combustion chambers
- Standard tip for smooth ignition in low-RPM operation
- Nickel alloy construction for corrosion resistance in marine use
- Ideal for small-displacement 4-stroke outboard engines
Technical Specifications:
| Attribute | Value |
|---|---|
| Model | NGK CR5HSB |
| Osculati Code | 47.558.50 |
| Thread Diameter | M10 × 1.0 mm |
| Reach | 12.7 mm |
| Hex Size | 16 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 | CR5HSB |
| Champion | 79Y |
The NGK CR5HSB is the optimal spark plug for small marine outboards that demand consistent ignition performance in a compact package. It provides reliable spark, reduced interference with onboard electronics, and long service life in saltwater conditions.
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