SA200 weak spark??
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  1. #1
    Join Date
    May 2008
    Location
    Sperry, OK
    Posts
    681

    SA200 weak spark??

    Code 7693 blackface, Magneto ignition.


    Little background... For several months, my machine when you first start it of a morning, you would have to completely choke it, and after turning over a few seconds would usually start. But didn't sound to be running on all cylinders for a bit (after about 30 seconds or so, it would finally sound right). after that, it would be good the rest of the day. Ran it about 7 hrs day before Thanksgiving with no problems.


    On Monday after Thanksgiving, NO START... Cleaned carb first, then discovered NO SPARK. So figured it was time for points and condenser (inspected and cleaned spark plugs. actually looked pretty good). replaced points and condenser, gapped them at 0.012", (found in the manual for my code number machine tonight they should be at 0.020" so that MAY be my problem) and have spark, but it seems weak. more of an orange spark than blue. I can get it to run if I hold throttle linkage close to idle, but if you let it try to rev up it will just die.


    Could coil be getting weak? Is the point gap too far off? I'm doing some 26" road bores and REALLY need to figure this out...

    I do have a spare machine that is missing some parts, that I could take the mag off of and switch out if I need to. I know it DID run, but it's sat for years.
    -------------------------
    Chemetron AC/DC 300 HF
    Snap-On MM300L
    Lincoln SP140
    Lincoln AC/DC 225g
    Lincoln SA200
    Lincoln SA200
    Miller Bobcat 225G
    Victor torches
    H&M and Mathey beveling machines
    McElroy Plastic pipe fusion

  2. #2
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    17,174

    Re: SA200 weak spark??

    Definitely need to correct the points gap which affects spark intensity on a mag. Throws the magnet/core timing off as well as ignition timing.

    Did it rain between uses? If yes, check the mag distributor cap for cracks as well as the rotor shaft hole for carbon tracks.

    What condition are the plug wires in? Have you checked for cross firing (spark jumping between wires) in the dark while cranking/running?
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

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  3. #3
    Join Date
    May 2008
    Location
    Sperry, OK
    Posts
    681

    Re: SA200 weak spark??

    Finally got it to run this morning. But spark still seemed weak. So took mag off other machine, installed points and condenser, and timed it like the B&W video shows (flywheel mark in center of sight window) on #4. Connector was just a little past straight across, unlike the video. Good spark now, but surely out of time according to backfire instead of starting. Why would coupler connection NOT be straight across like in the video?
    -------------------------
    Chemetron AC/DC 300 HF
    Snap-On MM300L
    Lincoln SP140
    Lincoln AC/DC 225g
    Lincoln SA200
    Lincoln SA200
    Miller Bobcat 225G
    Victor torches
    H&M and Mathey beveling machines
    McElroy Plastic pipe fusion

  4. #4
    Join Date
    May 2008
    Location
    Sperry, OK
    Posts
    681

    Re: SA200 weak spark??

    And when I say got it to run, it would run as long as you held throttle a little off idle. Would pop and backfire, and eventually die if you let it go to high idle.
    -------------------------
    Chemetron AC/DC 300 HF
    Snap-On MM300L
    Lincoln SP140
    Lincoln AC/DC 225g
    Lincoln SA200
    Lincoln SA200
    Miller Bobcat 225G
    Victor torches
    H&M and Mathey beveling machines
    McElroy Plastic pipe fusion

  5. #5
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    17,174

    Re: SA200 weak spark??

    You absolutely sure the governor and cam gears are timed correctly and not a tooth off as we've seen many times?
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  6. #6
    Join Date
    May 2008
    Location
    Sperry, OK
    Posts
    681

    Re: SA200 weak spark??

    Well…. I don't honestly know. This motor has never been apart. Today was first time Magneto has ever been off of it. My dad bought it new, so I know the complete history of it.
    -------------------------
    Chemetron AC/DC 300 HF
    Snap-On MM300L
    Lincoln SP140
    Lincoln AC/DC 225g
    Lincoln SA200
    Lincoln SA200
    Miller Bobcat 225G
    Victor torches
    H&M and Mathey beveling machines
    McElroy Plastic pipe fusion

  7. #7
    Join Date
    May 2008
    Location
    Sperry, OK
    Posts
    681

    Re: SA200 weak spark??

    after watching the video again, I see that I turned the Mag the wrong way to get to number 4... And I may not have been at the right mark on the flywheel. I did not see DC stamped on it. gonna try it again after dinner since its nice and dark and cold out...
    -------------------------
    Chemetron AC/DC 300 HF
    Snap-On MM300L
    Lincoln SP140
    Lincoln AC/DC 225g
    Lincoln SA200
    Lincoln SA200
    Miller Bobcat 225G
    Victor torches
    H&M and Mathey beveling machines
    McElroy Plastic pipe fusion

  8. #8
    Join Date
    May 2008
    Location
    Sperry, OK
    Posts
    681

    Re: SA200 weak spark??

    SUCCESS UPDATE:

    Found the right timing mark on flywheel, which put coupling straight across... Turned magneto drive backward to #4, which put its tabs straight across... re mounted it, installed new spark plugs... Its about 30 degrees here tonight, started on about 3rd revolution without even choking it.

    The old magneto, after taking it off, does not do the clicking when you turn it. Probably need to rebuild it.
    -------------------------
    Chemetron AC/DC 300 HF
    Snap-On MM300L
    Lincoln SP140
    Lincoln AC/DC 225g
    Lincoln SA200
    Lincoln SA200
    Miller Bobcat 225G
    Victor torches
    H&M and Mathey beveling machines
    McElroy Plastic pipe fusion

  9. #9
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    17,174

    Re: SA200 weak spark??

    If the impulse coupler isn't clicking when turning the mag either the dogs are stuck in the retracted position, broken (rare) or the dog stop screw is missing. The dog springs aren't that strong so my guess is the dogs got stuck in the retracted (running) position.
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

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