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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug B8HS-10 (5126)

SKU: GB-B8HS-10

$8.80
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The NGK B8HS-10 (Stock No. 5510) is a standard non-resistor nickel spark plug used in selected 2-stroke outboard motors. Featuring an M14 × 1.25 thread, 12.7 mm reach and 1.0 mm electrode gap, it provides dependable ignition and efficient heat transfer. Its NGK heat range 8 makes it suitable for selected Mercury, Mariner, Yamaha, Suzuki and other marine engines specifically requiring B8HS-10.

Key benefits

Key Benefits

  • - Standard NGK nickel spark plug
  • - Non-resistor design
  • - Copper-core centre electrode
  • - Effective heat dissipation
  • - NGK heat range 8
  • - 1.0 mm / 0.039" nominal gap
  • - Short-reach marine plug
  • - Flat gasket seat
  • - Suitable for selected 2-stroke outboard motors
  • - Direct replacement where NGK B8HS-10 is specified

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: B8HS-10
  • - NGK Stock Number: 5510
  • - Spark Plug Type: Standard nickel
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Pitch: 1.25 mm / 0.049"
  • - Thread Reach: 12.7 mm / 0.500"
  • - Hex / Spanner Size: 20.8 mm / 13/16"
  • - Spark Gap: 1.0 mm / 0.039"
  • - NGK Heat Range: 8
  • - Seat Type: Flat / gasket
  • - Resistor: No
  • - Centre Electrode: Nickel alloy with copper core
  • - Electrode Type: Standard / non-projected
  • - Ground Electrodes: 1

Compatible Outboard Motors

  • Yamaha Outboards
  • - Yamaha 6 HP – selected 2-stroke models
  • - Yamaha 8 HP – selected 2-stroke models
  • - Yamaha 9.9 HP – selected 2-stroke models
  • - Yamaha 15 HP – selected 2-stroke models
  • - Yamaha 20 HP – selected 2-stroke models
  • - Yamaha 25 HP – selected 2-stroke models
  • - Yamaha 30 HP – selected 2-stroke models
  • - Yamaha 40 HP – selected 2-stroke models

Mercury Outboards

  • - Mercury 4 HP – selected models
  • - Mercury 5 HP – selected models
  • - Mercury 6 HP – selected models
  • - Mercury 7.5 HP – selected models
  • - Mercury 9.8 HP – selected models
  • - Mercury 9.9 HP – selected models
  • - Mercury 15 HP – selected models
  • - Mercury 20 HP – selected models

Mariner Outboards

  • - Mariner 4 HP – selected 2-stroke models
  • - Mariner 5 HP – selected 2-stroke models
  • - Mariner 6 HP – selected 2-stroke models
  • - Mariner 8 HP – selected models
  • - Mariner 9.9 HP – selected models
  • - Mariner 15 HP – selected models
  • - Mariner 20 HP – selected models

Suzuki Outboards

  • - Suzuki DT4
  • - Suzuki DT5
  • - Suzuki DT6
  • - Suzuki DT8
  • - Suzuki DT9.9
  • - Suzuki DT15
  • - Suzuki DT20
  • - Suzuki DT25

Cross-Reference / OEM Part Numbers

  • Common B8HS-10 cross-reference families include
  • - NGK: B8HS-10
  • - NGK Stock No.: 5510
  • - Champion: L78C / equivalent applications
  • - Yamaha: selected OEM spark-plug references
  • - Mercury / Mariner: selected OEM spark-plug references
  • - Suzuki: selected OEM spark-plug references

Important Fitment Information

  • B8HS-10 should not be confused with B7HS-10, BR8HS-10, BP8HS-10 or B8HS.
  • The NGK designation is important
  • - B – 14 mm thread
  • - 8 – NGK heat range 8
  • - H – 12.7 mm / 1/2" thread reach
  • - S – standard electrode
  • - -10 – 1.0 mm nominal electrode gap
  • The B8HS-10 is non-resistor. If an outboard manufacturer specifies BR8HS-10, the resistor version should normally be used rather than substituting B8HS-10.
  • Because many Yamaha, Mercury, Mariner and Suzuki outboards changed spark-plug specifications according to model code, serial number and production year, horsepower alone should not be used to determine compatibility.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough idle
  • - Engine misfire
  • - Loss of power
  • - Poor acceleration
  • - Increased fuel consumption
  • - Carbon fouling
  • - Oil fouling
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Corroded plug body
  • - Cracked ceramic insulator

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