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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BR8HS-10 (1134)

SKU: GB-BR8HS-10

$8.80
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The NGK BR8HS-10 (Stock No. 1134) is a resistor-type nickel spark plug widely used in 2-stroke marine outboards. Featuring an M14 × 1.25 thread, 12.7 mm reach and 1.0 mm gap, its copper-core centre electrode provides efficient heat transfer and reliable ignition. The resistor design helps suppress electrical interference, making BR8HS-10 suitable for selected Yamaha, Tohatsu, Suzuki, Mercury/Mariner and other outboards specifically requiring this plug.

Key benefits

Key Benefits

  • - Resistor-type spark plug for reduced electrical/RFI interference
  • - Standard nickel electrode construction
  • - Copper-core centre electrode for effective heat dissipation
  • - NGK heat range 8
  • - 1.0 mm / 0.039" nominal electrode gap
  • - Short 12.7 mm / 1/2" reach
  • - Flat / gasket seat
  • - Designed for numerous 2-stroke marine engines
  • - Reliable ignition across normal marine operating conditions
  • - Direct replacement where BR8HS-10 is specified

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BR8HS-10
  • - NGK Stock Number: 1134
  • - Spark Plug Type: Standard resistor
  • - Thread Diameter: 14.0 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: Yes
  • - Resistance: approximately 5 kΩ
  • - Electrode Type: Standard / non-projected
  • - Centre Electrode: Nickel alloy with copper core
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1

Compatible Outboard Motors

  • Tohatsu Outboards
  • - Tohatsu M40C – 40 HP – selected 2-stroke models
  • - Tohatsu M40D – 40 HP – selected models
  • - Tohatsu M40D2 – 40 HP – selected models
  • - Tohatsu M50D – 50 HP
  • - Tohatsu M50D2 – 50 HP – selected models
  • - Tohatsu M60A – 60 HP – selected 2-stroke models
  • - Tohatsu M70A – 70 HP – selected models
  • - Tohatsu M70B – 70 HP – selected models
  • - Tohatsu M70C – 70 HP – selected models
  • - Tohatsu M90A – 90 HP – selected models
  • - Tohatsu M90A2 – 90 HP – selected models
  • - Tohatsu M115A – 115 HP – selected models
  • - Tohatsu M115A2 – 115 HP – selected models

Yamaha Outboards

  • - Yamaha 40 HP – selected 2-stroke models
  • - Yamaha 50 HP – selected 2-stroke models
  • - Yamaha 55 HP – selected models
  • - Yamaha 60 HP – selected 2-stroke models
  • - Yamaha 70 HP – selected 2-stroke models
  • - Yamaha 75 HP – selected models
  • - Yamaha 80 HP – selected models
  • - Yamaha 85 HP – selected models
  • - Yamaha 90 HP – selected 2-stroke models
  • Specific Yamaha model codes can vary considerably by market and year, so the original plug specification should be checked.

Suzuki Outboards

  • - Suzuki DT40 – 40 HP
  • - Suzuki DT50 – 50 HP
  • - Suzuki DT55 – 55 HP
  • - Suzuki DT60 – 60 HP
  • - Suzuki DT65 – 65 HP
  • - Suzuki DT75 – 75 HP
  • - Suzuki DT85 – 85 HP
  • Fitment varies according to production year and ignition system.

Cross-Reference / OEM Part Numbers

  • - NGK: BR8HS-10
  • - NGK Stock No.: 1134
  • - Tohatsu: selected OEM applications
  • - Yamaha: selected OEM marine applications
  • - Suzuki: selected OEM marine applications
  • - Mercury / Mariner: selected OEM applications

Important Fitment Information

  • BR8HS-10 is not the same as B8HS-10, BP8HS-10, BPR8HS-10 or BP8H-N-10.
  • The NGK designation indicates
  • - B – 14 mm thread
  • - R – resistor-type spark plug
  • - 8 – NGK heat range 8
  • - H – 12.7 mm / 1/2" reach
  • - S – standard electrode design
  • - -10 – 1.0 mm nominal electrode gap
  • The resistor is particularly important on engines where the manufacturer specifies a suppressed plug to reduce interference with ignition components and marine electronics.
  • Do not select BR8HS-10 solely by horsepower. Different versions of the same horsepower outboard may use different spark plugs depending on model code, year, ignition system and market.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Reduced engine power
  • - Poor acceleration
  • - Increased fuel consumption
  • - Carbon fouling
  • - Oil fouling
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Corrosion around the plug shell
  • - Cracked ceramic insulator

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