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Rotax 912UL will not turn off

in 912 / 914 Technical Questions 13 years ago
Hi Guys,

I have just installed used 912UL on my PPC.
All wires and ground are correctly connected.
When turning the kill mag to off, the engine sometimes stop but sometimes doesn't!.
When the engine doesn't stop I need to unplugged the lower CDI connector and plug it back after that the engine again is stopping but one out of 10's off's it will keep running.

I think there is a problem with the lower CDI, but asking for your advise:

1.Is there a different between the two CDI?
2.Do anyone familiar with this kind of problem/
3>can you come up with solutions or any Idea's?

Thank you all in advanced.

Nir

  • Re: Rotax 912UL will not turn off

    by » 13 years ago

    Hi Nir,

    I doubt it is the ignition module. Even though a module can fail they are usually fairly bullet proof. If it was a module issue it should be there all the time and not intermittent.
    This type of thing is usually the wiring. This can usually be attributed to a poor ground somewhere. This is where I would start. You may have a ground, but it may not be a good one.
    Check the two white wires that that go into the corner of each 6 pin ignition module plug and make sure they are firmly in place and that one is not partially broken.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Rotax 912UL will not turn off

    by » 13 years ago

    Hi Nir

    I would also check the wires on both modules. If they are the older type there were problems with the wire core breaking, but the PVC sheath looked perfectly ok. This used to cause all sorts of intermittent problems, but the most common one was the one you are describing.

    The easiest way of checking is to pull each wire between the plug and module, if the core has failed the wire will stretch.

    Cheers Mark.


    IMG_1372_2012-04-11.JPG (You do not have access to download this file.)
      
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  • Re: Rotax 912UL will not turn off

    by » 13 years ago

    Thank you guys for the good advises.
    I will check that out tomorrow ,and come back to report what I have found.

    All for one and one for all!
    Nir
      
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  • Re: Rotax 912UL will not turn off

    by » 13 years ago

    Nir,

    You might also check the switches and wiring in the whole kill switch circuit. A loss of ground anywhere in the circuit or a bad switch could cause the problem. If you have to unplug the lower CDI, then that's the one that has the ground problem. The other one is cutting off as it should.

    Bill.
      
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  • Re: Rotax 912UL will not turn off

    by » 13 years ago

    Guys,

    Fix the problem.
    It was indid the CDI..:(
    I found out that there is a link of 282 Ohm between the Kill engine white wire from the CDI to the ground in the faulty CDI while at the other one I had no conductivity at all.
    I have checked all that you recommended, but problem was solved only after replacing the CDI with another.

    Thank you for the good advices.

    Nir :P
      
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