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Help Electric trouble - CBR

Discussion in 'Honda 250cc In-line 4's' started by Gert, Aug 20, 2018.

  1. Gert

    Gert Well-Known Member

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    Last saturday, I brought the CBR home being a little ill (the bike :)). Suddenly she did not start because the power was gone??? I noticed nothing before?? So I pushed the bike on, she started and I could drive, but soon after that the bike was hesitating more and more. So, I switched of the lights and it went better.
    At home, I checked the battery and she had 9 volts left. Apparently enough for ignition.
    Another strange thing, if I stood still before trafficlights, a small amount of smoke poored up from the engine somewhere??

    Anyway, today I hope to have time to check things out. Let you know.
     
  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Sound's like a failed reg/rect or a bad earth
    Smoke may just be unburned fuel (due to too small spark eg flat battery) and it's getting past the ring's and causing a bit of crankcase pressure and coming out the crankcase breather tube.
     
  3. Gert

    Gert Well-Known Member

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    Think you are right. Breather hose was not attached to the filterbox.
    Rectifier is doing nothing, so ordered a new one.

    While I am there, I can measure AC from the stators. Anybody any info on this one?
     
  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Check all your terminal's are good and clean, with no corrosion, check earth's etc too.
    Not sure what the stator should be putting out, but all 3 phases should be very close.
    What model CBR is it?
    Get your battery on charge asap too but don't leave it on too long.
     
  5. XCite Bikes

    XCite Bikes Parts and Accessories Staff Member 250cc Vendor Contributing Member

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    If the bike has been in storage for a while before you bought it, it's possible the battery is now weak. It may hold 12v, but not enough amps to work properly. Before buying a new regulator, use a multimeter to check if the old one is still good or not. The battery is not really expensive, but a new regulator is.
    As @my67xr said before, the smoke could easily be something burning (oil left on the bottom of engine from last oil change), and should go away. If it doesn't, check if smoke is coming from the connection of the headers and the engine. It could be a gasket is no longer sealing.
     
  6. Gert

    Gert Well-Known Member

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    No storage. The bike is used often and is in my possesion since 2006. I do have an official battery tester and it says that the battery died. No problem, that is not so expensive.

    I tested the stator resistance, and two were 0.4 and one is 0.9?
    I ordered an good rectifier and I will see what happens.

    Do we have a manual with the values of the reg and/or stators for the MC22?
     
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  8. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    From the CBR250 base manual in the resources section

    Stator coil resistance 0.3-0.4 ohms @ 20 degrees celsius
    Stator output - 18.5 amps @ 5,000rpm (battery fully charged, reg/rec disconnected from stator, measuring AC voltage on stator)
    Regulator voltage - 14.0-15.0 volts

    You also need to check each stator winding against an earth point on the frame, anything less then an infinite reading means that the stator is shorted

    One phase at 0.9 ohms is double the maximum spec, but I can't see it being a problem, but I could be wrong.


    It sounds like your regulator/rectifier has died
     
  9. Gert

    Gert Well-Known Member

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    Got a new rectifier, but that does not change a thing. So, unfortunately, it is the alternator. Ript her of the bike this morning and is going te be rewind. Pretty expensive (± 200 euro), but no choice over here.

    Perhaps my old rectifier is okay?

    Took a pic, but cannot upload it now, maybe later.
     
  10. Gert

    Gert Well-Known Member

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    Pics:


    mc22alternator02.JPG

    mc22alternator01.JPG
     
  11. kiffsta

    kiffsta Senior Member

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  12. Gert

    Gert Well-Known Member

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    Received the new rewinded alternator yesterday, that is fast! Now waiting for the gasket and oil filter and she can be brought back to life.

    FYI: checked resistance and before it was 0.4 and 0.4 and 1.0.
    Now I have: 0.2 and 0.2 and 0.3.

    Curious how much AC she is doing.
     
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  13. Gert

    Gert Well-Known Member

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    Woke her up this evening. AC = is now 10.8 volt on each terminal.
    Bought an new rectifier, but the old one appears to be fine.
    Got me some thermal grease and I think I keep the old rectifier in the bike.
    Always nice to have a spare one. It fits the NC30 too.
     
  14. kiffsta

    kiffsta Senior Member

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    Who did you get to do the rewind ?
     
  15. Gert

    Gert Well-Known Member

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