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QL78YC - Champion Spark Plug ( #938M)

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$5.84

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Part Number
QL78YC

Manufacturer
Champion

Replaces OEM 0437929.

Plug Type QL78YC
Seat Type Gasket
Hex Size (Inch) 0.813
Hex Size (MM) 20.650
Thread Size (Inch) 0.551
Thread Size (MM) 14.000
Thread Reach (Inch) 0.5
Taper Diameter (Inch) 0.25
Installed Height (Inch) 2.24
Insulator Projection (Inch) 0.06
Gap (Inch) 0.022-0.028
Gap (MM) 0.56-0.71
Center Electrode Diameter (Inch) 0.1
Center Electrode Material Nickel Copper Alloy
Ground Electrode Material Nickel Copper Alloy
Ground Electrode Quantity 1
Classification Champion Copper Plus Small Engine
Resistor Plug Yes
Resistor Type Q-Type Inductive Suppressor
Manufacturer Heat Range 78
Electrical Terminal Type Non-Removable Nut

Technical information (PDF)
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Champion Champion Plug (#938m) Ql78yc is equivalent to parts:

  • 505449 Evinrude Johnson OMC BRP
  • 505448 Evinrude Johnson OMC BRP
  • 437929 Evinrude Johnson OMC BRP
  • 938 Mercury Marine
  • 816837Q Mercury Marine
  • 816837B2 Mercury Marine
  • 14814Q Mercury Marine
  • 14814568 Mercury Marine
  • 33816837Q Mercury Marine
  • 33816837B 2 Mercury Marine
  • 33 14814Q Mercury Marine
  • 33 14814568 Mercury Marine
  • 33   938 Mercury Marine
Champion spark plugs use an extruded copper core in the center electrode that maintains accurate control of heat range, optimizing the performance and longevity of the spark plug. This not only will provide you with a dependable start but gives you the confidence that you'll keep going.

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