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Hello,

We have a 912ULS engine, 200 hours since new that produces vibration that feels like one cylinder does not fire when on the left ignition switch.  The RPM gauge is within the allowable RPM drop; close to 200 but a rough running condition persists.  Visually,  I can see the vibrate.

We switched the vertical connectors on the ignition modules and the problem follows the module - meaning the right position now produces the problem.  

The problem only appears at or above 4000 RPM at 3500 no issue with the ignition check.

Any thoughts/other checks?

Thanks

Don

 

 

  • Re: 912ULS Ignition Issue

    by » 8 months ago


    200 rpm for me is a still a lot. Normally I only see 50-100 rpm drop. This of course depends on whether you're using analog gauges vs digital ones and what rpm you're doing the mag check at. The higher the rpm the higher the mag drop.

    You may want to check the air gaps on the trigger coils on the back of the engine at the flywheel.


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


  • Re: 912ULS Ignition Issue

    by » 8 months ago


    Thanks - Ill check gaps on the trigger coil before I order a new module.

    Don


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