Rotax 582

Category: 2 Stroke Technical Questions 2 weeks ago

Having issues with my Rotax 582. Up until four weeks ago everything was running fine, my EGTs and CHTs Temps were within specs and even across both cylinders at cruise.  Then I started having issues with my probes. The issues with the probes turned out to be broken wires near the probes. I replaced all the probes, changed out the spark plugs and rebuilt the Carbs, since then my Mag cylinder has been running about 30 to 50 degrees Fahrenheit hotter on the EGTs then the Prop cylinder, the CHTs are still pretty close to each other.  I’ve done the following to try and diagnose/fix the issue: Checked the EGT probes against one heat source, swapped probes at both the Muffler and the wires leading up to the MGL Gauge, swapped carbs, swapped spark plugs, changed out the spark plug wires, ran the engine briefly on one Mag to see if the temps would change, did a compression test, did a vacuum test on the case, weighed the floats, checked the height of the petrol in the bowls, did a pneumatic sync of both carbs and changed out the main jets.  So far nothing has made any difference. Anyone have any ideas?

  • Re: Rotax 582

    by » 2 weeks ago


    Make sure you’re running a ground wire directly from the MGL gauge to the engine block.


  • Re: Rotax 582

    by » 2 weeks ago


    Thermal Image of Exhaust. I also checked the ground wire.

    24054_2_20191005T185304.JPG (You do not have access to download this file.)

  • Re: Rotax 582

    by » 2 weeks ago


    The FLIR definitely shows the MAG Cylinder is Hotter.

    It is not a Probe/Gauge/Wiring/Ground issue.

    You report having rebuilt the carbs.  I would start there first.

    You are allowed a 25°C (43°F) temp difference.  You are not all that far off.

    Any chance that parts from one carb got swapped into the other?

    Moving the Jet Needle clip on the Hot cylinder down (Richer) by one ring may be all that is needed.

     


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    whertzel1@yahoo.com
    Clicking the "Thank You" is appreciated by all.

  • Re: Rotax 582

    by » 2 weeks ago


    This was a problem with the 618 as well. Rotax issued a technical bulletin that the main jet on the hotter cylinder must be replaced with larger main jet. Try it.

     


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