Marine spark plugs are essential components designed to ignite the fuel-air mixture in marine engines, ensuring smooth and efficient performance. Built for outboard and inboard engines, they withstand harsh marine conditions, including exposure to saltwater and humidity.
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1-2 weeks delivery time Osculati 47.557.46 – Champion XC12PEPB is a high-performance resistor spark plug with a projected nose and copper core, engineered for 4-stroke marine engines under high thermal load. With a 14 mm thread, 19 mm (3/4") reach, and 16 mm (5/8") hex, it ensures precise ignition, extended durability, and full compatibility with onboard electronics.
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$ 12.96
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1-2 weeks delivery time Osculati 47.557.59 – Champion QC10WEP is a marine resistor spark plug designed for 4-stroke high-output engines. With a 14 mm thread, 19 mm (3/4") reach, and 16 mm (5/8") hex, it features a copper core, projected tip, and integrated RFI suppression, offering superior ignition, durability, and compatibility with sensitive marine electronics.
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$ 14.14
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1-2 weeks delivery time Osculati 47.557.60 – Champion QC8WEP is a high-performance resistor spark plug designed for 4-stroke marine engines. With a 14 mm thread, 19 mm (3/4") reach, and 16 mm (5/8") hex, it features a copper core, projected nose, and built-in RFI suppression, ensuring stable ignition, clean combustion, and compatibility with onboard electronics.
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$ 16.54
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1-2 weeks delivery time Osculati 47.558.12 – NGK B6HS is a non-resistor spark plug with a 14 mm thread, 12.7 mm (1/2") reach, and 20.8 mm (13/16") hex. Designed for smooth ignition and high durability in 2-stroke marine outboards from Yamaha, Mercury, Suzuki, Mariner, Tohatsu, Selva, and Honda. It corresponds to Champion L86C.
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$ 8.29
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1-2 weeks delivery time NGK B6S (Osculati 47.558.74) 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 standard gap. Suited for legacy 2-stroke marine engines by Yamaha, Mercury, Suzuki, Tohatsu, Honda, Selva, and Mariner. Offers stable spark and strong performance in simple ignition systems. Fully interchangeable with Champion J8C.
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$ 9.48
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1-2 weeks delivery time Osculati 47.558.01 – NGK B7HS is a non-resistor marine spark plug designed for use in a wide range of 2-stroke outboard engines. With a 14 mm thread, 12.7 mm (1/2") reach, and 20.8 mm (13/16") hex, it provides reliable cold starts, strong spark, and excellent performance in engines from Mariner, Yamaha, Mercury, Suzuki, Tohatsu, Selva, and Honda. Equivalent to Champion L82C.
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$ 8.39
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1-2 weeks delivery time Osculati 47.558.10 – NGK B7HS-10 is a non-resistor spark plug with a factory-set 1.0 mm gap, built for reliable ignition in 2-stroke marine outboards by Yamaha, Mercury, Mariner, Suzuki, Tohatsu, Selva, and Honda. It features a 14 mm thread, 12.7 mm (1/2") reach, and 20.8 mm (13/16") hex. Equivalent to Champion L77JC4.
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$ 9.82
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1-2 weeks delivery time Osculati 47.558.03 – NGK B8HS is a non-resistor marine spark plug with a 14 mm thread, 12.7 mm (1/2") reach, and 20.8 mm (13/16") hex. Designed for standard use in 2-stroke outboards by Yamaha, Mercury, Mariner, Suzuki, Tohatsu, Selva, and Honda. Offers strong ignition performance and reliable combustion. Equivalent to Champion L78C.
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$ 8.48
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1-2 weeks delivery time Osculati 47.558.08 – NGK B8-HS-10 is a non-resistor marine spark plug with a factory-set 1.0 mm gap. Featuring a 14 mm thread, 12.7 mm (1/2") reach, and 20.8 mm (13/16") hex, it delivers high ignition efficiency and stable combustion in 2-stroke outboards by Yamaha, Mercury, Suzuki, Mariner, Tohatsu, Selva, and Honda. Equivalent to Champion L78C.
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$ 10.21
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1-2 weeks delivery time 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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$ 8.29
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1-2 weeks delivery time Osculati 47.558.06 – NGK B9HS-10 is a marine-grade spark plug designed for 2-stroke outboard engines operating at high RPM. It features a 14 mm thread, 12.7 mm (1/2") reach, 20.8 mm (13/16") hex, and a factory-set 1.0 mm gap. Designed for performance and durability, it is equivalent to Champion L77JC4.
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$ 9.70
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1-2 weeks delivery time NGK BKR6E (Osculati 47.558.49) is a long-reach resistor-type marine spark plug with M14 × 1.25 mm thread, 19 mm reach, 16 mm hex, and a factory-set 0.8 mm gap. It features a projected insulator and copper core for efficient combustion. Suitable for 4-stroke outboards from Yamaha, Mercury, Suzuki, Mariner, Tohatsu, Selva, and Honda. Equivalent to Champion RC12YC.
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$ 12.03
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1-2 weeks delivery time Osculati 47.558.13 – NGK BP6HS is a non-resistor, projected-tip spark plug designed for reliable marine ignition in 2-stroke and 4-stroke outboards. With a 14 mm thread, 12.7 mm (1/2") reach, 20.8 mm (13/16") hex, and a medium-hot heat range, it fits engines by Yamaha, Mercury, Suzuki, Mariner, Tohatsu, Selva, and Honda. Equivalent to Champion L87YC.
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$ 8.24
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1-2 weeks delivery time Osculati 47.558.14 – NGK BP7HS is a projected-tip, non-resistor marine spark plug with a 14 mm thread, 12.7 mm (1/2") reach, and 20.8 mm (13/16") hex. Designed for enhanced combustion in 2-stroke outboards by Yamaha, Mercury, Suzuki, Mariner, Tohatsu, Selva, and Honda. Medium heat range and excellent anti-fouling properties. Cross-reference: Champion L82YC.
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$ 9.06
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1-2 weeks delivery time NGK BP7HS-10 (Osculati 47.558.66) is a non-resistor spark plug with M14 × 1.25 mm thread, 12.7 mm reach, 20.8 mm hex, and a wide 1.0 mm factory-set gap. Built for 2-stroke marine outboards by Yamaha, Honda, Mercury, Suzuki, Tohatsu, Selva, and Mariner. It features a projected insulator for improved ignition efficiency and fouling resistance. No direct Champion equivalent.
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$ 10.01
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1-2 weeks delivery time NGK BP8HN-10 marine spark plug (Osculati 47.558.22) is a high-performance ignition component designed for marine outboard engines from brands like Yamaha, Mercury, Mariner, Suzuki, Tohatsu, Selva, and Honda. It features a thread size of M14 × 1.25 mm, 19 mm reach, 20.8 mm hex, and a preset gap of 1.0 mm. This plug is ideal for 2-stroke and select 4-stroke applications and corresponds to Champion L78YC.
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$ 10.38
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1-2 weeks delivery time The Osculati 47.558.94 – NGK BP8HS-10 spark plug is a non-resistor type plug designed for optimal ignition performance in marine outboard engines. With a 14 mm thread diameter, 12.7 mm (1/2") reach, and projected core nose, it is particularly well-suited for older two-stroke models used in Mariner, Yamaha, Suzuki, Mercury, Tohatsu, Selva, and Honda engines. It offers reliable cold-start performance and superior heat dissipation for harsh marine environments.
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$ 7.86
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1-2 weeks delivery time NGK BP8HS-15 (Osculati 47.558.82) is a non-resistor marine spark plug with M14 × 1.25 mm thread, 12.7 mm reach, 20.8 mm hex, and a wide 1.5 mm factory-set gap. Its cold heat range (8) and projected insulator make it ideal for 2-stroke outboards from Yamaha, Mercury, Honda, Suzuki, Tohatsu, Selva, and Mariner. Suitable for high-speed operation with strong resistance to fouling. No Champion cross-reference provided.
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$ 7.73
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1-2 weeks delivery time NGK BPR5EFS (Osculati 47.558.83) is a resistor spark plug with M14 × 1.25 mm thread, 19 mm reach, 16 mm hex, and 0.8 mm factory gap. Its warm heat range (5) and projected insulator make it suitable for a wide variety of 4-stroke and 2-stroke marine outboards from Yamaha, Mercury, Suzuki, Honda, Tohatsu, Selva, and Mariner. No Champion equivalent listed.
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$ 9.92
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1-2 weeks delivery time NGK BPR5ES (Osculati 47.558.28) is a versatile marine spark plug with a 14 mm thread, 19 mm reach, 20.8 mm hex size, and a factory-set 0.9 mm gap. Designed for compatibility with Yamaha, Mercury, Mariner, Suzuki, Tohatsu, Selva, and Honda outboards. It features a built-in resistor for EMI suppression and is cross-compatible with Champion RN11YC4. Ideal for 4-stroke marine engines requiring clean, efficient combustion.
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$ 11.16
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Why is selecting the right spark plug critical for optimal engine performance in marine applications?
Selecting the right spark plug is critical for optimal engine performance in marine applications because it ensures proper ignition, efficient fuel combustion, and reliable operation in harsh conditions. Using the correct part number guarantees compatibility with the engine, maximizing performance and preventing potential damage. This careful selection increases engine efficiency, providing the best experience on the water.
Choosing the correct part number from trusted brands like Champion Spark Plugs helps maintain engine health and ensures smooth, efficient operation on the water.
How do marine spark plugs differ from standard auto parts used in cars?
Marine spark plugs differ from standard auto parts because they are specifically designed to withstand the harsh conditions of marine environments, including exposure to saltwater, humidity, and extreme temperature fluctuations. They often feature corrosion-resistant materials and a more robust construction to handle the unique demands of outboard and inboard engines. These features ensure reliable ignition and optimal performance even in challenging marine applications.