Wisper PAS removal

Discussion in 'Electric Bicycles' started by Farmerjim, Mar 5, 2018.

  1. Farmerjim

    Farmerjim Just Joined

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    My Wisper 905 has developed an intermittant fault, i.e. no pedal assist. The throttle works fine. I think there is a loose wire in the PAS as jiggling the wire will return the bike to normal.

    That said, I will need to remove the PAS and check it out which brings me to my question ........ Are Wisper cranks a normal size and will any crank puller fit? Halfords do one for about £7 .

    Thanks for looking!
    Jim
     
  2. Emo Rider

    Emo Rider Pedelecer

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    If you have a magnetic disk that passes by the sensor, do this first. Check the gap between the magnetic disk and the pickup. It should be less than 5mm. Check to make sure the disk turns with the crank. Sometimes the little teeth that snug it to the crank axle break off. The only reason you would need to remove the crank is to replace the disk. If you have a 905 torque, take it to the shop. I do not recommend attempting to take out the bottom bracket that contains the torque sensor yourself.
     
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  3. Farmerjim

    Farmerjim Just Joined

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    Thanks Emo, I'll have another look tomorrow although I think it will be a wiring fault ; with the bike upside-down and moving the crank the motor will cut in if the wire's in the right position.
     
  4. Nealh

    Nealh Pedelecer

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    A std type of puller will be needed if the BB is sq taper.

    David Miall may see this or contact him @Amps, their Wisper add is at the side of screen.
    He will carry spares for all the range even after they have ceased production. If it a non torque model then repair is easier and simple with a new replacement.
     
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  5. Wisper Bikes

    Wisper Bikes Trade Member

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    Hi Jim I’m away at the moment at the factory. All of the above us accurate.

    I think I saw an email from you addressed to support@amps.bike if it wasn’t you I suggest you contact Claud using this address. He will certainly be able to sort out the issue.

    All the best, David
     
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  6. Farmerjim

    Farmerjim Just Joined

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    Thanks David, yes it was me, I'll contact Claude if I need a new part.
    Jim
     
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