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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BPZ8HS-10 (3133)

SKU: GB-BPZ8HS-10

$29.00
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The NGK BPZ8HS-10 is a resistor/suppressor-type projected spark plug developed for selected 2-stroke marine engines. Featuring an M14 × 1.25 thread, 12.7 mm reach and 1.0 mm gap, it provides dependable ignition while reducing radio-frequency interference that can affect marine electronics. Its heat range 8 and short-reach gasket-seat construction make it suitable for specific Mercury and Mariner outboards where BPZ8HS-10 is specified.

Key benefits

Key Benefits

  • - Marine resistor/suppressor spark plug
  • - Projected electrode configuration
  • - Helps reduce radio-frequency and ignition interference
  • - Copper-core construction for effective heat transfer
  • - NGK heat range 8
  • - 1.0 mm / 0.039" nominal gap
  • - Short-reach marine plug
  • - Flat / gasket seat
  • - Designed for selected 2-stroke outboard motors
  • - Suitable where BPZ8HS-10 is specifically specified

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BPZ8HS-10
  • - Spark Plug Type: Resistor / suppressor marine spark plug
  • - 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 / Suppressor: Yes
  • - Electrode Configuration: Projected
  • - Centre Electrode: Nickel alloy with copper core
  • - Ground Electrodes: 1
  • - Application: Marine / 2-stroke outboard
  • Compatible Outboard Motors

Mercury Outboards

  • - Mercury 6 HP 2-stroke
  • - Mercury 8 HP 2-stroke
  • - Mercury 9.9 HP 2-stroke
  • - Mercury 15 HP 2-stroke
  • - Mercury 20 HP 2-stroke
  • - Mercury 25 HP 2-stroke
  • - Mercury 30 HP 2-stroke
  • - Mercury 40 HP 2-stroke
  • - Mercury 50 HP 2-stroke
  • - Mercury 55 HP 2-stroke
  • - Mercury 60 HP 2-stroke
  • Exact model/year/serial-number verification is important because many Mercury engines within these horsepower ranges specify different plugs.

Mariner Outboards

  • - Mariner 6 HP
  • - Mariner 8 HP
  • - Mariner 9.9 HP
  • - Mariner 15 HP
  • - Mariner 20 HP
  • - Mariner 25 HP
  • - Mariner 30 HP
  • - Mariner 40 HP
  • - Mariner 50 HP
  • - Mariner 55 HP
  • - Mariner 60 HP
  • The model code and production year should be checked before confirming fitment.

Cross-Reference / OEM Part Numbers

  • - NGK: BPZ8HS-10
  • - Mercury / Mariner: selected Mercury Marine suppressor-plug applications
  • - NGK BP8HS-10: related non-suppressor plug — not automatically interchangeable
  • - NGK BPZ8H-N-10: related Mercury suppressor plug — different plug specification; do not assume interchangeability

Important Fitment Information

  • BPZ8HS-10 should not be confused with BP8HS-10 or BPZ8H-N-10.
  • The NGK designation identifies important construction differences
  • - B – 14 mm thread
  • - P – projected electrode
  • - Z – special suppressor / firing-end construction
  • - 8 – NGK heat range 8
  • - H – 12.7 mm / 1/2" thread reach
  • - S – standard firing-end configuration
  • - -10 – nominal 1.0 mm electrode gap
  • The Z designation is significant. A BPZ8HS-10 should therefore not be replaced solely on the basis that another plug has the same thread size, reach, heat range and gap. For Mercury and Mariner engines, always confirm the model, year and serial number, as seemingly identical horsepower engines can have different ignition systems and spark-plug requirements.

Signs the Spark Plug Needs Replacing

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

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