Backlash question

Discussion in 'Motorized Bicycle General Discussion' started by Evan, Jan 14, 2010.

  1. Evan

    Evan New Member

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    Can anyone tell me what the backlash should be between the flywheel gear and the drive gear? Is this adjusted by shimming? My newest build is howling a little and the backlash appears to be maybe .001 at best.
    Thanks, Evan
    dnut
     
  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Where do you think you can shim it?
     
  3. Evan

    Evan New Member

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    Not sure....thats why I ask. Some gearsets on machines accomplish this by shimming behind one of the gears. If the teeth are at any sort of an angle removing or adding shims behind the gear would work.
     
  4. 2door

    2door Moderator
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    Shimming works on helical cut gears, not straight cut ones like the ones in a Chinese 2 stroke. Helical gears have rounded surfaces that when properly spaced or positioned to each other relative to the curvature of the gear tooth will run quieter and more effeciently. Straight, or square cut gears mesh at the same angle so shimming either the drive or driven gear in or out will not have any effect on gear mesh only the amount of surface contact. Hence no noise reduction. This is an over simplication of gear engineering but I hope it answers your question.
    Tom
     
    #4 2door, Jan 15, 2010
    Last edited: Jan 15, 2010
  5. GearNut

    GearNut Active Member

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    At the factory I think they set it to 1/8 the diameter of a piece of rice.
    JK!
     
  6. Evan

    Evan New Member

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    brown or white?
     
  7. wdbtchr

    wdbtchr Member

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    I believe that would be wild....it's flatter.
     
  8. Ghost0

    Ghost0 New Member

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    Slap some good grease on the teeth and it will help.
     

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