NGK CR4HSB Spark Plug – Osculati 47.558.15

Osculati 47.558.15 – NGK CR4HSB Spark Plug

The Osculati 47.558.15 features the NGK CR4HSB spark plug, specifically engineered for small-displacement 4-stroke marine engines. Its compact 10 mm thread and short hex size make it ideal for tight-engine configurations such as portable outboards and tiller motors. A built-in resistor suppresses electromagnetic interference to protect sensitive onboard marine electronics like GPS and radios.

This model uses a projected-tip copper core electrode for improved spark exposure, better fuel ignition, and lower fouling risk. The plug comes pre-gapped for marine applications and offers a cold heat range, suitable for high-load, small-engine operation. While it does not have a direct Champion equivalent, it is widely used by OEMs across the marine industry.

Main Features:

• Model: NGK CR4HSB
• Thread Size: 10 mm
• Reach: 12.7 mm (1/2″)
• Hex Size: 16 mm
• Tip Style: Projected
• Resistor: Yes – 5 kΩ internal resistance
• Heat Range: 4 (cold)
• Core Material: Copper core
• Champion Equivalent: – (No direct match)

Compatible Engine Brands:

• Yamaha
• Mariner
• Mercury
• Tohatsu
• Suzuki
• Selva
• Honda (compact 4-stroke models)

Benefits:

• Compact size ideal for portable outboards and small engines
• Resistor-equipped for safe use with modern electronics
• Cold-rated for high-speed operation and anti-fouling
• Projected tip ensures reliable ignition and combustion efficiency

Technical Specifications Table:

The Osculati 47.558.15 – NGK CR4HSB spark plug is the go-to option for compact marine outboards requiring electronic-safe ignition and precise combustion. Its unique size, resistor protection, and projected-tip performance make it a critical component for modern portable marine engines.