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On the Rotax 912 wiring diagram I see something called "Starting equipment at the electronic modules" (labeled #26). They are energized when the starter switch is engaged. Can someone please explain them to me?
  • Re: 912 ignition modules

    by » 8 years ago


    You have a fairly new engine with soft start or just replaced your modules? This is most likely the soft start wires that go to the starter solenoid.

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


    Thank you said by: Ken Ryan

  • Re: 912 ignition modules

    by » 8 years ago


    My friend just upgraded for it. Engine really starts better - for first few seconds run's different (soft-start map) and then normally. These wires connected to starter are tells modules that now is engine startup.

    Thank you said by: Ken Ryan

  • Re: 912 ignition modules

    by » 8 years ago


    That's correct. If you just installed new soft start modules the plastic pin connector had one hole on each connector module empty. This is where you should add the new wire that goes down to the ignition solenoid. So when you turn the key and the solenoid becomes energised the signal is sent to the modules to energise the soft start feature.

    Now instead of trying to start at 4 degrees before TDC it starts at 3 degrees after TDC. It stays like that for those 6-7 seconds then reverts to the 26 degrees BTDC.

    You don't get the full soft start capabilities unless you also change out the flywheel, but it's still better than the older way even without the flywheel.

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


  • Re: 912 ignition modules

    by » 8 years ago


    Thanks, so is this now standard on all new 912s? What about 914s? I noticed this when comparing the wiring diagrams for 912 and 914. These are shown on the 912 but not the 914.

  • Re: 912 ignition modules

    by » 8 years ago


    I don't remember the date when the engine's switched to the new soft start modules, but after that time all engines come with them.

    Rob can probably remember better than I can when the new modules were going on engines from the factory.

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


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