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Hi,

I have a problem with my 447, engine won't accelerate when the motor temperature reach cca 80°C.
When the engine is cold receiving throottle without any problems from min to max rpm.

80°C is critical "border".
And starting engine is without any problems , cold or hot, motor starts at the first pull.

Any ideas/solutions would be appreciated :-)
  • Re: 447 throttle problem

    by » 7 years ago


    My first test would be a compression check.
    If the piston/cylinder gap is getting excessive, you may be losing compression as it warms up.

    Please report the full history of this engine.
    Any maintenance recently?

    Bill.

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


  • Re: 447 throttle problem

    by » 7 years ago


    Up until now...has it always been ok?

    Nick.

  • Re: 447 throttle problem

    by » 7 years ago


    Not enough information to make a diagnosis. Early 447 engines had point Ignition systems, if this is the case it could be time to set it up properly. It sounds like like the engine is running rich, this could be from needle/needle jet wear or an indication of a engine mechanical issue. Stuck rings, failing con rod bearings come to mind. The first place to look is through the exhaust ports after you remove the exhaust manifold. Let us know what you find.
    Dennis

  • Re: 447 throttle problem

    by » 7 years ago


    Thanks for the effort !
    A malfunction is "allegedly" diagnosed, the problem is in the condenser.
    we'll see .
    I'll report to you about progress.

  • Re: 447 throttle problem

    by » 7 years ago


    When you say it will not accelerate when Hot...

    What does it sound like when you open the throttle?
    Does it just continue to idle nicely?
    Does it slow down or speed up a little?
    Does it Mis-Fire? Sound overly rich or lean?

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


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