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Thread: Flathead ignition

  1. #1
    4 Cycle Member
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    Flathead ignition

    I tried to put my new Arc 6620 flywheel on my (very old) Briggs flathead yesterday. The points cover prevented it from going on by about 1/4". I called Arc and they said I need a newer style ignition setup which eliminates points. They said get Briggs p/n 397358.

    Is this correct? Is this all there is to it? Just bolt on this coil and remove the points, condenser, and points pushrod?

  2. #2
    4 Cycle Advanced User
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    Plug the hole and your done

  3. #3
    Grumpy Ol' Admin Bob Evans's Avatar
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    That's correct.

  4. #4
    4 Cycle Member
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    Thanks guys

  5. #5
    4 Cycle Advanced User
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    You may have to trim off the points cover boss, where the points and condenser cover mounting screw was too.As noted plug the hole where the breaker arm and plunger was, and loose the un-needed parts.The little points spring does make a good pull spring for a tillotson set up .

  6. #6
    4 Cycle Advanced User Jimbo's Avatar
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    How about putting a Briggs PVL flywheel and coil on it.
    It's a much better ignition system.
    The PVL timing doesn't retard like the flat head and it has an aluminum flywheel.
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  7. #7
    4 Cycle Advanced User
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    I think he's got the arc flywheel already, Jimbo - but a good suggestion nonetheless.

    Phil,
    Pull the points cover off, pull the points, condenser & plunger. Take a short sheet metal screw or button head allen and thread down into the plunger hole (be certain that the end of the screw does NOT touch the crankshaft journal at all.) I like to put a small dab of silicone sealant on the threads as well. = Job done and you're ready to install your new flywheel and solid state ignition coil.



    -----
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    Brian Carlson
    Carlson Racing Engines
    Vector Cutz
    www.CarlsonMotorsports.com
    28 years of service to the karting industry
    Linden, IN
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    bcarlson@CarlsonMotorsports.com

  8. #8
    4 Cycle Advanced User
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    The Briggs #397358 Coil comes with a little steel plug to press into the points plunger hole.

    Fits nicely unless the hole has extreme wear.

    I like to put a glob of JB Weld over top for extra security, but RTV will work just as well.

    When ordering coil from supplier, make sure they check to see plug is still in there.

    It should also include a B&S Logo timing key and a new kill switch wire.

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