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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BR7HS-10 (1098)

SKU: GB-BR7HS-10

$8.80
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The NGK BR7HS-10 (Stock No. 1098) is a resistor-type nickel spark plug widely used in selected 2-stroke outboard motors. Featuring an M14 × 1.25 thread, 12.7 mm reach and 1.0 mm gap, it provides reliable ignition while helping suppress electrical interference. Its copper-core construction promotes effective heat transfer, making it suitable for numerous Tohatsu, Yamaha, Suzuki and other marine applications where BR7HS-10 is specified.

Key benefits

Key benefits

  • Key Benefits
  • - Resistor-type spark plug for electrical/RFI suppression
  • - Standard nickel electrode construction
  • - Copper-core centre electrode for efficient heat transfer
  • - Designed for many 2-stroke outboard applications
  • - Factory 1.0 mm / 0.039" gap
  • - NGK heat range 7
  • - Short-reach gasket-seat design
  • - Corrosion-resistant plated shell
  • - Suitable for engines specifically specifying BR7HS-10

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BR7HS-10
  • - NGK Stock Number: 1098
  • - 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: 7
  • - Seat Type: Flat / gasket
  • - Resistor: Yes – approximately 5 kΩ
  • - Centre Electrode: Nickel, copper core
  • - Centre Electrode Diameter: 2.5 mm
  • - Electrode Type: Standard / non-projected
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Terminal: Removable nut / threaded terminal

Compatible Outboard Motors

  • Tohatsu Outboards
  • Tohatsu's current application information specifically identifies BR7HS-10, Tohatsu part 9701-1-1015, for
  • - Tohatsu M9.9 – 9.9 HP
  • - Tohatsu M25 – 25 HP
  • - Tohatsu M30 – 30 HP Tohatsu
  • - M9.9D2 – 9.9 HP
  • - M15B – 15 HP, 2007 onward
  • - M15D2 / MS15D2 – 15 HP
  • - M16 – 16 HP
  • - M18C – 18 HP, 2007 onward
  • - M18E – 18 HP, 1996–1999
  • - M20 – 20 HP
  • - M25C3 – 25 HP, 1997–2007
  • - M25C4 – 25 HP
  • - M30A3 – 30 HP, 1997–1999
  • - M30A4 – 30 HP, 2000–2007
  • - M40C – 40 HP, selected applications
  • - M40D – 40 HP, 1997–2006
  • - M40D2 – 40 HP, selected applications

Yamaha Outboards

  • - Yamaha E8D – 8 HP
  • - Yamaha 9.9D – 9.9 HP
  • - Yamaha 9.9F – 9.9 HP, 1985–2020
  • - Yamaha 13.5A – 13.5 HP
  • - Yamaha 15D – 15 HP
  • - Yamaha 15F – 15 HP, 1995 onward
  • - Yamaha 20D – 20 HP
  • - Yamaha 25B – 25 HP, 2-cylinder 2-stroke, 2001–2010
  • - Yamaha 25J – 25 HP, 3-cylinder 2-stroke, 1987–1999
  • Additional marine application data lists BR7HS-10 for selected Yamaha 150 HP 2-stroke models, including 150, 150TJR, 150TXR, C150, DX150, L150, P150, S150, SX150, V150, V150TLR and VX150. Exact year/model verification is important for these larger engines.

Suzuki Outboards

  • - Suzuki DT9.9 – 9.9 HP, 1977–1982
  • - Suzuki DT15C – 15 HP, 1992–1997
  • - Suzuki DT20K – 20 HP, through 1985
  • - Suzuki DT20P – 20 HP, selected models
  • - Suzuki DT25C – 25 HP, 1993–2000
  • - Suzuki DT25E – 25 HP, selected models
  • - Suzuki DT30C – 30 HP, 1993–1998

Cross-Reference / OEM Part Numbers

  • - NGK: BR7HS-10
  • - NGK Stock No.: 1098
  • - Tohatsu: 9701-1-1015
  • - Suzuki: 09482-00277
  • - Suzuki: 09482-00533
  • - Yamaha: 94702-00271
  • - Mercury / MerCruiser: 33-828942

Important Fitment Information

  • BR7HS-10 should not be confused with B7HS-10, BP7HS-10, BPR7HS-10 or BR7ES.
  • The R identifies a resistor plug, while -10 denotes the nominal 1.0 mm gap. BR7HS-10 has a 12.7 mm short reach, whereas BR7ES has a 19 mm reach.
  • Also note that the correct plug can differ between apparently similar Tohatsu models. Tohatsu currently specifies BPR7HS-10 for M4, M5, M6, M8 and M9.8, but BR7HS-10 for M9.9, M25 and M30.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Intermittent misfire
  • - Loss of engine power
  • - Poor acceleration
  • - Increased fuel consumption
  • - Carbon or oil fouling
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Corrosion around the plug body
  • - Cracked ceramic insulator

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