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912 knocking with cold weather

in 912 / 914 Technical Questions 6 years ago

  • Re: 912 knocking with cold weather

    by » 6 years ago

    Let's consider a choke problem.

    If one choke is not actuating, the engine will be imbalanced at low throttle settings.
    It will clear with an advanced throttle and once warm, are you disengaging the choke without realizing it is also clearing the roughness?

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: 912 knocking with cold weather

    by » 6 years ago

    Hi Bill,

    Choke is disengaged as soon as the engine is running, then engine runs normally. After 1 min, runs roughly.......

    Bon dimanche
      
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  • Re: 912 knocking with cold weather

    by » 6 years ago

    ... On starting, ... Choke is disengaged as soon as the engine is running ... the engine works well 1 minute and then begin to turn roughly. ... The only way to stop it is to increase RPM...


    If a choke remains active after you think it has been disengaged, The engine may initially run well and then run rough after it warms up a minute later.
    Advancing the throttle would bypass the choke and clear up the roughness.

    It is sounding more like a choke issue.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: Patrick COSNARD
      
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  • Re: 912 knocking with cold weather

    by » 6 years ago

    Hi Bill,

    At what Rpm the choke is bypassed ? roughness remain until 3.000 Rpm.
    I'll check if choke does'nt remain engaged. It could be possible as mixture seems too rich. Another cause could be weared carb or float needles, or/and weared mixing tube.
    What do you think about these investigations ?

    Thanks a lot !
      
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  • Re: 912 knocking with cold weather

    by » 6 years ago

    Have you weighed the floats to see if the engine is flooding due to heavy floats. 7 grams max per set.

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

      
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