new thing today

Discussion in 'Motorized Bicycle Trouble Shooting' started by crassius, Aug 5, 2016.

  1. crassius

    crassius Well-Known Member

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    guy that builds these sent me a repair job - bike showed up and was REAL hard to get it to start, took a long while to pump old fuel out of motor

    motor was loose, chain was loose, rear wheel bearings were loose, carb was missing parts, so did a bunch o' work

    later, rode it a while, then called customer

    he shows up & no start ??!!??

    hour and a half later found the mag coil with busted wire, but the bare end was making good contact most of the time, but not always (was perfect every time I put the meter on)

    finally opened cover and poked it and saw it wasn't soldered, never saw or heard of this before, but wrapped end of wire with 1/2 inch of new, soldered that , then soldered loose end to armature (extra length gives it room to vibrate without pulling loose again so I always do them that way)

    runs fine now and will see if still OK in AM

    rough fix when you can't trust the meter reading
     
  2. 2door

    2door Moderator
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    What kind of "meter"? Digital or analog? Digital meters can give false readings both in voltage and continuity sometimes. I don't trust them. I use a Simpson 260 when I want to be sure of what I'm reading. I have a high end Fluke VOM that sits in its case in a drawer. My venerable Simpson is always within reach.

    Tom
     
  3. crassius

    crassius Well-Known Member

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    tried a 2nd meter - readings were all good, but sometimes varied by 10 or 20 ohms as if probe was on a corroded spot - rubbing probe to get better connection as one does when on a corroded spot, was how I found that wire was actually just lying on the solder
     
  4. Springfieldscooter

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    o.k., Ive got to ask....

    How do you test a magneto, using a meter?

    Thanks in advance!
     
  5. crassius

    crassius Well-Known Member

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    info is on the board here in maybe 200 threads

    ohms from blue to ground will be 250, or 350, or 480 depending which kind of mag you have (readings will be +- about 30 ohms)
     

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