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Thread: 185S Won't Start Bad Spark Plug Cap

  1. #1
    ATC King's Avatar
    ATC King is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    185S Won't Start Bad Spark Plug Cap

    Just a PSA.

    I was riding, then wasn't. Engine stopped and I was on the side of the road.


    Looked at it this morning, got some spare parts out and test meter, then went to work. Wam, bam, can of Spam, fixed in the AM. Spark plug cap was bad. Put a spare one on and the world is right again.


    A reminder that they use resistor spark plug caps and they can and do, occasionally go bad. Supposed to be ~5K resistance. Mine was in outer space. I'll buy a new one later, the spares I have are all just as old.

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    The story of three wheels and a man...

  2. #2
    Join Date
    Jun 2010
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    Cold Lake, Alberta, Canada
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    2,659
    Good to know, thanks ATC King! I thought they weren't more than a simple boot and clip not unlike a B&S lawnmower cap. Wonder if all ATV/motorcycle ones are around that resistance range?
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Resto Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1984 Big Red 200es w/85 250 front end
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

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  3. #3
    ATC King's Avatar
    ATC King is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Jul 2010
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    I think that's a common resistance value. It's about radio interference because these have solid core plug wires.

    On my Honda motorcycles, the inside part that clips onto the plug is removable with a flat screwdriver and the resistor comes out with the spring. That's good because if the resistor fails, a solid piece of wire or metal can be put in for an emergency fix.
    The story of three wheels and a man...

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