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Marine & Outboard Spark Plugs

NGK SD05F Resistor Spark Plug Cap

SKU: GB-SD05F

$15.00
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The NGK SD05F is a 5 kΩ resistor spark plug cap designed to connect the high-tension ignition lead securely to compatible spark plugs. Its compact straight configuration, durable phenolic construction and internal resistor help suppress electrical interference while providing reliable ignition performance. SD05F is used on selected motorcycle and marine/outboard ignition systems, but fitment should be determined by the required plug terminal, lead connection and cap dimensions.

Key benefits

Key Benefits

  • - NGK Part Number: SD05F
  • - 5 kΩ resistor construction
  • - Straight spark plug cap design
  • - Helps suppress ignition-related electrical interference
  • - Secure connection between HT ignition lead and spark plug
  • - Durable heat-resistant construction
  • - Compact design for restricted engine spaces
  • - Suitable for selected marine/outboard ignition systems
  • - Replaceable separately from the ignition lead where applicable

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: SD05F
  • - Component: Spark plug cap / suppressor cap
  • - Configuration: Straight
  • - Resistance: 5 kΩ
  • - Resistor Code: 05
  • - Body Material: Phenolic/resin-type insulating body
  • - Ignition Lead Connection: Screw-in type
  • - Spark Plug Connection: Terminal-type connection
  • - Weather Protection: Rubber sealing boots
  • - Application: Ignition HT lead to spark plug
  • - Quantity: 1 cap

Important Fitment Information

  • SD05F is a spark plug cap, not a spark plug.
  • Do not confuse it with other NGK resistor caps simply because they also contain a 5 kΩ resistor. NGK cap prefixes and suffixes can indicate differences in
  • - Cap angle
  • - Plug diameter
  • - Terminal connection
  • - Waterproofing
  • - Overall dimensions
  • - HT cable connection
  • Always compare the existing cap before replacement.

Signs the Spark Plug Cap Needs Replacing

  • - Engine misfire
  • - Intermittent ignition
  • - Difficult starting
  • - Spark leakage
  • - Visible cracking in the cap
  • - Hardened or split rubber seals
  • - Corroded internal terminal
  • - Loose connection to the spark plug
  • - Loose HT lead connection
  • - Excessive or open-circuit resistance
  • - Engine cutting out when wet

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