Osculati 47.558.06 – NGK B9HS-10 Spark Plug
The Osculati 47.558.06 features the NGK B9HS-10 spark plug, purpose-built for high-RPM 2-stroke marine engines. It includes a factory-set 1.0 mm gap for precise ignition timing and a copper core for optimal heat dissipation. With a cold heat range of 9, it resists fouling in high-performance applications. This non-resistor plug is a direct replacement for Champion L77JC4.
Main Features:
- Model: NGK B9HS-10
- Thread Size: 14 mm
- Reach: 12.7 mm (1/2″)
- Hex Size: 20.8 mm (13/16″)
- Resistor: No
- Pre-set Gap: 1.0 mm
- Heat Range: 9 (cold)
- Electrode Type: Standard tip, copper core
- Champion Equivalent: L77JC4
Application Notes:
- Ideal for high-revving 2-stroke marine outboards
- Not recommended for engines requiring RFI suppression
- Designed to prevent pre-ignition in high-load applications
Benefits:
- Factory-gapped for consistent ignition timing (1.0 mm)
- Cold rating prevents fouling in performance applications
- High thermal conductivity for extended plug life
- Reliable operation in saltwater marine environments
Technical Specifications Table:
| Parameter | Value |
|---|---|
| Item Code | 47.558.06 |
| Model | NGK B9HS-10 |
| Thread Size | 14 mm |
| Reach | 12.7 mm (1/2″) |
| Hex Size | 20.8 mm (13/16″) |
| Resistor | No |
| Pre-set Gap | 1.0 mm |
| Heat Range | 9 |
| Champion Equivalent | L77JC4 |
| Application | 2-stroke high-performance outboard engines |
The Osculati 47.558.06 – NGK B9HS-10 spark plug is a reliable choice for marine professionals who maintain high-speed 2-stroke engines. Its colder rating and pre-set gap support superior performance and fouling resistance under demanding marine conditions.
