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Marine & Outboard Spark Plugs

NGK V-Power Spark Plug ZFR5F (7558) (5165)

SKU: GB-ZFR5F

$11.80
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The NGK ZFR5F (Stock No. 5165) is a projected-tip resistor spark plug used in selected Mercury four-stroke outboards. Its nickel centre electrode and copper-core construction provide reliable ignition and efficient heat transfer in demanding marine operation. Featuring an M14 × 1.25 thread, 19 mm reach, 16 mm hex and NGK heat range 5, ZFR5F is commonly specified for later-generation Mercury 75–115 HP FourStroke engines.

Key benefits

Key Benefits

  • - NGK Stock Number: 5165
  • - Nickel centre electrode
  • - Copper-core construction
  • - Projected firing end
  • - Built-in resistor
  • - M14 × 1.25 thread
  • - 19 mm / 0.750" reach
  • - 16 mm / 5/8" hex
  • - NGK heat range 5
  • - Flat/gasket seat
  • - Single ground electrode
  • - Reliable ignition and heat transfer
  • - Used in selected Mercury FourStroke outboards

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: ZFR5F
  • - NGK Stock Number: 5165
  • - Type: Standard resistor spark plug
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - NGK Heat Range: 5
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Firing End: Projected
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Mercury FourStroke
  • - Mercury 75 HP FourStroke – 2.1L
  • - Mercury 80 HP FourStroke – 2.1L
  • - Mercury 90 HP FourStroke – 2.1L
  • - Mercury 100 HP FourStroke – 2.1L
  • - Mercury 115 HP FourStroke – 2.1L

Important Fitment Information

  • Mercury has used several different spark plugs in 75–115 HP FourStroke engines. Do not select ZFR5F by horsepower alone.

Important production distinctions include

  • - Mercury 75 HP 1596 cc → LFR5A-11
  • - Mercury 75 HP 1.7L → LFR4A-E
  • - Mercury 75 HP 2.1L → ZFR5F
  • - Mercury 90 HP 1596 cc → LFR5A-11
  • - Mercury 90 HP 1.7L → LFR4A-E
  • - Mercury 90 HP 2.1L → ZFR5F
  • - Mercury 115 HP earlier 1.7L → LFR6A-11
  • - Mercury 115 HP later 1.7L → LFR4A-E
  • - Mercury 115 HP 2.1L → ZFR5F
  • The engine serial number should always be checked before ordering.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation under acceleration
  • - Reduced power
  • - Poor high-RPM performance
  • - Increased fuel consumption
  • - Carbon deposits
  • - Fuel fouling
  • - Excessive electrode wear
  • - Enlarged electrode gap
  • - Corrosion
  • - Cracked ceramic insulator

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