Copper Spark Plug
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Copper Spark Plug
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Autolite Copper Spark Plug

Part No. 386 Warranty Details  
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Autolite Copper Spark Plugs are guaranteed to deliver quick starts, good fuel economy and smooth acceleration.

Product Features:
  • Copper cored center electrode for higher thermal conductivity
  • Specially engineered high nickel alloy center and ground electrode for extended life
  • High alumina ceramic for high dielectric strength
  • Leak proof, heat fused internal seal for durability
  • Multi-rib insulator prevents flash-over
  • 2 year limited warranty
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Electrode Tip Material:Resistor
Reach:1/2 in
Seat Type:Gasket
Thread Diameter:18 mm
Tip Configuration:Standard
Wrench Diameter:7/8 in

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3 Questions | 5 Answers
Displaying questions 1-3
  • Q:

    Why is the Autolite 386 spark plug classified as "Double Platinum" but only comes in Copper?
    Asked on 8/10/2015 by Plug for tractorr from Raleigh NC

    1 answer



      This Autolite Double Platinum Spark Plug (Part No. 386) has high nickel alloy side electrode with full platinum tips. It also has necked-down full copper core center electrode. It features a platinum-to-platinum firing. Virtually eliminates gap erosion, reduces misfires, and provides improved durability. It's the superior-performing spark plug providing preferred technology for DIS engines.

      Answered on 8/11/2015 by Steve from AAP
  • Q:

    Is this the right plug for my Massey Ferguson Model 40 tractor?
    That was the number on the plugs I took out. 386.
    Asked on 11/14/2011 by Anonymous

    2 answers

    • A:

      Probably. To be certain, I'd check with your local Massey-Ferguson (AGCO) dealer. In case you didn't know, AGCO bought out MF a few years back. You can Google them to find a dealer near you. I know these are correct for a GAS John Deere 4020, and also select JD 2-cylinder tractors as well. Set your gap at .025". Best of luck!

      Answered on 7/28/2015 by AJ - Prof. Mechanic & former Parts Pro from Ontario, NY


      Please provide your vehicle’s engine specification for further assistance.

      Answered on 11/15/2011 by Aaron from AAP
  • Q:

    does it fit lawnmowers
    Asked on 5/9/2010 by mcintyre from dolton il

    2 answers

    • A:

      A lawnmower? No, it's highly unlikely. These are LARGE spark plugs, with 18mm threads and a 1/2" reach. Typically used in larger cubic displacement gasoline engines used in Farm Tractors. For example, I know for a fact that one correct application for these plugs is to be used in a John Deere 4020 tractor with the gasoline engine. They are also used in select vintage 2-cylinder JD tractor engines as well.

      Answered on 7/28/2015 by AJ - Prof. Mechanic & former Parts Pro from Ontario, NY


      It is a small engine spark plug such as a lawn mower engine.

      Answered on 5/10/2010 by Kevin from AAP
Displaying questions 1-3

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