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912 uls VIBRATION

in General Tech Discussion 3 weeks ago

Question for Roger Lee and others.

I have a 2016 100 hp 912ULS with 480 hrs TT.  I bought the plane recently and found there is a significant vibration in the 4000 RPM range + or - 200 RPM.

Engine has a new E-Prop that is supposedly pre-balanced at the mfg. It appears to be installed correctly with the color coded blades, engine spacer and prop spinner in the proper orientation.  There is a weight inside the prop spinner.

New plug wires.  All plugs less than 100 hrs and all 8 plug insulators appear a light chocolate brown.

Grounds for the Ignitions that are attached to the intake manifold have been removed and cleaned

Engine starts easily and idles very smooth

Air cleaners cleaned and re-oiled

New floats installed within last 60 hrs

Carbs balanced within last 60 hrs

Any Suggestions would be appreciated.  

 

 

 

  • Re: 912 uls VIBRATION

    by » 3 weeks ago

    get a level or prop protractor and double check the prop blades to make sure they are the same pitch. Any blade off more that 1/10 degree from the others is a sin. I would also double check the carb sync as it can be off. Make sure your K&N air filter isn't over oiled. 

    has anyone been inside the carbs other than new floats? 

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

      
    Report

  • Re: 912 uls VIBRATION

    by » 3 weeks ago

    Hi Roger,

    I thought the carbs had been rebuilt in the last 100 hrs but I cannot find the record of that being done.  Also what happens if the K&N air filters are over oiled?  

    I will have the carb balance rechecked.  Is it procedure to check it at 4000 RPM where the vibration occurs and make an adjustment at that RPM if needed.

    I have owned 4 rotax 912uls and never had a vibration at any RPM's above and idle.

    This E-prop seems so flimsy compared to a Warp drive or Kiev.  It is longer and appears it could resonate at the tips 

    Regards and thanks for your help,

    William Campbell

      
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