SKU:
Osculati-47.558.81
€ 5,72
1-2 weeks delivery time
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NGK B8S (Osculati 47.558.81) is a non-resistor marine spark plug with M14 × 1.25 mm thread, 12.7 mm reach, 20.8 mm hex, and 0.7 mm gap. Designed for older and performance-tuned 2-stroke outboards from Yamaha, Mercury, Suzuki, Tohatsu, Selva, Honda, and Mariner. With a cold heat range (8), it provides detonation resistance and consistent performance. No Champion equivalent listed.
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Osculati 47.558.81 – NGK B8S Marine Spark Plug
The NGK B8S (Osculati 47.558.81) is a cold-range, non-resistor spark plug made for classic 2-stroke outboards and older marine engines without electronic ignition systems. It provides reliable spark in high-temperature applications, making it ideal for engines operating at sustained high RPM. The simple, non-resistor construction offers maximum voltage delivery for robust ignition in older magneto or CDI systems.
Key Features:
- Cold heat range (8) prevents pre-ignition in hot-running 2-stroke engines
- Non-resistor design ensures full spark energy transfer
- Short 12.7 mm reach ideal for compact combustion chambers
- Durable nickel alloy electrode resists wear and corrosion
- Designed for legacy and high-performance 2-stroke outboard engines
Technical Specifications:
Attribute Value Model NGK B8S Osculati Code 47.558.81 Thread Diameter M14 × 1.25 mm Reach 12.7 mm Hex Size 20.8 mm Heat Range 8 (cold) Gap 0.7 mm Electrode Type Standard Resistor No
Manufacturer Compatibility:
- Yamaha
- Mercury
- Mariner
- Suzuki
- Honda
- Tohatsu
- Selva
Cross Reference:
Brand Model NGK B8S Champion –
The NGK B8S is an excellent spark plug choice for traditional 2-stroke marine engines that require a cold plug without modern resistor protection. It delivers full spark intensity and durability in engines running at high loads, making it a favorite among vintage outboard technicians and performance tuners.
Documents
Osculati Catalogue 2025 - page 874 Size: 150,5 Kb -
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