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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug LKR7E (1643)

SKU: GB-LKR7E

$23.95
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The NGK LKR7E (Stock No. 1643) is a long-reach resistor spark plug used in selected Yamaha four-stroke outboards, including the F70 family. Featuring a nickel centre electrode with copper core, projected firing end and resistor construction, it provides reliable ignition and efficient heat transfer. The plug uses an M12 × 1.25 thread, 26.5 mm reach, 16 mm hex and 0.9 mm gap.

Key benefits

Key Benefits

  • - NGK Stock Number: 1643
  • - Standard nickel centre electrode
  • - Copper-core construction for efficient heat transfer
  • - Built-in resistor – approximately 5 kΩ
  • - Projected firing end
  • - Long 26.5 mm / 1.043" reach
  • - M12 × 1.25 thread
  • - **16 mm / 5/8" hex
  • - 0.9 mm / 0.035" gap
  • - NGK heat range 7
  • - Flat/gasket seat
  • - Single ground electrode
  • - Designed for selected Yamaha four-stroke marine engines

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: LKR7E
  • - NGK Stock Number: 1643
  • - GTIN: 087295116432
  • - Type: Standard resistor spark plug
  • - Thread Diameter: 12 mm / 0.472"
  • - Thread Size: M12 × 1.25
  • - Thread Reach: 26.5 mm / 1.043"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Spark Gap: 0.9 mm / 0.035"
  • - NGK Heat Range: 7
  • - Seat: Flat / gasket
  • - Resistor: Yes
  • - Resistance: approximately 5 kΩ
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Terminal: Solid
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Yamaha F40
  • - Yamaha F40G
  • - 40 HP
  • - 4-stroke
  • - 996 cc
  • - From 2011 in NGK's application data
  • - Spark plug: LKR7E
  • - Gap: 0.9 mm
  • - Thread: 12 mm
  • - Reach: 26.5 mm
  • - Hex: 16 mm

Yamaha F70

  • - Yamaha F70
  • - 70 HP
  • - Four-stroke
  • - Spark plug: NGK LKR7E
  • - Yamaha replacement reference: 94702-00429-00

Cross-Reference Part Numbers

  • - NGK: LKR7E
  • - NGK Stock No.: 1643
  • - Yamaha: 94702-00429
  • - Yamaha: 94702-00429-00
  • - Yamaha: LKR-7E000-00-00
  • - Australian marine supplier code: 375593

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation during acceleration
  • - Reduced engine power
  • - Poor high-RPM operation
  • - Increased fuel consumption
  • - Carbon fouling
  • - Fuel or oil deposits
  • - Excessive electrode wear
  • - Enlarged spark gap
  • - Corrosion
  • - Cracked ceramic insulator
  • - Damaged sealing washer

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