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Thread: new rotor 5.5 ohms

  1. #1
    Registered User beano08's Avatar
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    new rotor 5.5 ohms

    Hi all,

    Any reason why a new rotor from Rick would come in at around 5.5 ohms? It's for a /6 so I was expecting closer to 3. Do the rings need to be lightly sanded and cleaned? There's definitely a film of oil covering everything

  2. #2
    '99 '03 '06 National Co-Rally Chair Friedle's Avatar
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    Rotor

    Have you asked Rick? He will give you an honest answer. You trusted him enough to purchase the part from him. His reputation for customer is excellent. BTW, I am assuming you mean Rick Jones.

    Friedle
    Ride fast safely

  3. #3
    Liaison 20774's Avatar
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    5.5 ohms is no man's land...should be 3.4 or so. The earlier rotors were 6.9 and the later ones were 2.8. I would think that the meter probes should cut through the oil to make good contact.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  4. #4
    Heartbeat of my R100GS Guenther's Avatar
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    When you measure such low Ohms test the tips by connecting the tips first. Some meters might already show some low resistance which you have to subtract from measuring the rotor.

    For the measurement it might help to lightly rub the tips on the copper rings of the rotor.

    My replacement rotor was cold 2.8 Ohms (3.3 according to specs) - yes, temperature also makes a difference when measuring a low resistance.

    And Rick might tell you that what you measured is about the resistance for your model according to specs.

    /Guenther

  5. #5
    Aspiring Profligate Jeff488's Avatar
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    Not trying to disparage your meter, but are you sure it's accurate and zeroed?

    At those small readings it doesn't take much to move an ohm or two.
    '08 BMW R1200RT
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  6. #6
    Registered User beano08's Avatar
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    Quote Originally Posted by Guenther View Post
    When you measure such low Ohms test the tips by connecting the tips first. Some meters might already show some low resistance which you have to subtract from measuring the rotor.

    For the measurement it might help to lightly rub the tips on the copper rings of the rotor.

    My replacement rotor was cold 2.8 Ohms (3.3 according to specs) - yes, temperature also makes a difference when measuring a low resistance.

    And Rick might tell you that what you measured is about the resistance for your model according to specs.

    /Guenther
    I'm dumb, meter measures about 3.0 on its own which would put me spot on. Bike is charging at a healthy 14.2 volts at barely 3k rpm! Thanks all for your help!

  7. #7
    Aspiring Profligate Jeff488's Avatar
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    Cool beans, daddio!

    Or some such congratulatory exclamation.
    '08 BMW R1200RT
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  8. #8
    Registered User toooldtocare's Avatar
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    Quote Originally Posted by beano08 View Post
    I'm dumb, meter measures about 3.0 on its own which would put me spot on. Bike is charging at a healthy 14.2 volts at barely 3k rpm! Thanks all for your help!
    Now, go ride and enjoy the bike. Glad it is up and running.

    Wayne.

  9. #9
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by beano08 View Post
    I'm dumb, meter measures about 3.0 on its own which would put me spot on. Bike is charging at a healthy 14.2 volts at barely 3k rpm! Thanks all for your help!
    Sign up for harbour freight coupons and get their cheap digital meter for 10 bucks or less. Some sales lately they give you one for free if you buy anything else!

    They will measure better than the one you are using now. I've checked one against my Fluke which is a decent unit and they are bang on.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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