Oil dripping from magneto wires

Discussion in 'Motorized Bicycle General Discussion' started by tudorvintiloiu, May 15, 2010.

  1. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    WWII planes didn't have total loss oiling systems, those were the WWI ROTARY engines that spun with the prop and had the crank fixed in place.
     
  2. GearNut

    GearNut Active Member

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    It is a small piece of metal about 3/8" long by 1/16" thick. It is a half moon shape. Grey in color. It is not just a piece of steel, it is a softer alloy designed to shear before damage occurs.
     
  3. kennessey

    kennessey New Member

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    Thanks for the intel! Any chance you can describe where in the casing it resides. I would like to make sure mine didn't fall out.

    Many thanks!
     
  4. GearNut

    GearNut Active Member

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    It fits in a half moon shaped notch machined into the crank shaft. Only 1/2 of the key height will fit into the slot (rounded side into slot, longer flat side facing up).
    You superglue the key into the notch to hold it there (wait for the glue to dry) so it will resist falling out when the magnetic rotor is slid onto the shaft.
    The magneto's magnetic rotor has a matching slot that the other half of the key fits into.
    It can be tricky to get the rotor to slide onto the shaft without popping the key out of the notch on the shaft, even though you superglued it in. Patience is a virtue.
    It will help to remove the coil from the engine first. that way you will not be fighting the magnetic force trying to pull the rotor every which way.
     
  5. GearNut

    GearNut Active Member

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    Oh yeah, mark the outside of the coil and the rotor with a stripe or something using a magic marker before you remove them, that makes it easier to re-assemble correctly. It is very easy to re-assemble them backwards as both will go on either way.
     
  6. charles.paskell

    charles.paskell New Member

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    you should seal that wire inlet with gas/oil resistant silicone or watter can get in and ruin your magneto coil...it happed to me
     

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