Spark Plugs

Discussion in 'Mechanic and Repair' started by MHubes, Jul 13, 2002.

  1. MHubes

    MHubes LawnSite Member
    Posts: 16

    I recently changed my spark plugs on a Briggs and Stratton V Twin engine with Magnetron ignition from Champion J19LM to the new Champion EZ-Start replacement for the J19LM and the mower wouldn't start when hot and had difficulty igniting fuel. Has anyone else experienced this problem? Does anyone know why it happened? I switched back to the old plugs and everything is fine now.
  2. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Posts: 342

    That's odd. I figured those were "better" than the regular ones. I recently put one in my rear engine mower, and it runs and starts fine. :confused:
  3. Jeff in AL

    Jeff in AL LawnSite Senior Member
    from Alabama
    Posts: 729

    If you do in fact have a B&S V-Twin engine, than you SHOULD be using a Champion RC12YC, or an RC14YC spark plug. However if you have an opposed B&S twin, then you would use the RJ19LM, or a J19LM. The J19LM has a much shorter reach than the RC12, or 14 plugs, along with a very different heat range to let the engine run correctly.

  4. sdwally

    sdwally LawnSite Senior Member
    Posts: 385

    In small engines Champions just don't seem to last. We try to use Nippon Densos or NGKs. Especially in two cycle equipment. Most B&S engines use a ND W20M-U(short plug) or a W20-U(tall plug). If the unit uses oil then a hotter plug W14-U can be used.

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