The NGK ZFR7F-11 is a projected-tip resistor spark plug designed for engines requiring a colder NGK heat range 7 plug with a 1.1 mm factory gap. Its nickel-alloy electrode, copper-core construction and V-Groove design promote dependable ignition and efficient heat transfer. With an M14 × 1.25 thread, 19 mm reach and 16 mm hex, it must be matched to the exact outboard application before installation.
Marine & Outboard Spark Plugs
NGK V-Power Spark Plug ZFR7F-11 (2975) (6855)
SKU: GB-ZFR7F-11
$12.50
Key benefits
Key Benefits
- - NGK ZFR7F-11
- - V-Groove electrode design
- - Built-in resistor
- - Projected firing tip
- - Copper-core centre electrode
- - Nickel-alloy electrodes
- - M14 × 1.25 thread
- - 19 mm / 0.748" reach
- - 16 mm / 5/8" hex
- - 1.1 mm / 0.043" nominal gap
- - NGK heat range 7
- - Flat gasket seat
- - Colder heat range than ZFR6F-11
Specifications & Dimensions
- - Brand: NGK
- - Part Number: ZFR7F-11
- - Spark Plug Type: Resistor / V-Groove
- - Thread Diameter: 14 mm / 0.551"
- - Thread Pitch: 1.25 mm
- - Thread Reach: 19 mm / 0.748"
- - Hex Size: 16 mm / 5/8"
- - Factory Gap: 1.1 mm / 0.043"
- - NGK Heat Range: 7
- - Seat Type: Flat / gasket
- - Resistor: Yes
- - Centre Electrode: Nickel alloy with copper core
- - Firing End: Projected
- - Ground Electrode: Single
Signs the Spark Plug Needs Replacing
- - Difficult starting
- - Engine misfire
- - Rough or unstable idle
- - Hesitation during acceleration
- - Reduced engine power
- - Poor high-RPM performance
- - Increased fuel consumption
- - Carbon fouling
- - Fuel fouling
- - Excessive electrode wear
- - Excessive electrode gap
- - Corroded electrodes or shell
- - Cracked ceramic insulator
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