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912ULS Startup

in General Tech Discussion 11 years ago

  • Re: 912ULS Startup

    by » 11 years ago

    Same problem I had. One was failed for an unknown time and the other failed intermitantly. Once started they would both begin to fire and run fine for the rest of the day. Very frustrating. :S Lockwood has a pair of new style modules, with the soft start built in, for slightly less than half the price of the olde style.

    Alan
      
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  • Re: 912ULS Startup

    by » 11 years ago

    I replaced the modules with the new one from Lockwood, it started immediately. It is a little strange when it first starts with the retarded timing, but after a few seconds it advances and runs normally'

    Thanks,

    Ray
      
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  • Re: 912ULS Startup

    by » 11 years ago

    Hi Raymond,

    Glad it finally worked out. Seems like this last year I have been hearing more and more about ignition modules being a problem. Had a guy call me yesterday with the same problem and new modules fixed his problem. I have heard of some placing an ice pack on top of the modules that won't start and then they start every time. I'm stating to wonder if during a certain time period during the MFG something had changed.

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

    Thank you said by: Raymond Moran
      
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  • Re: 912ULS Startup

    by » 11 years ago

    Could you add some clarity on the comment of a retarded start in this thread. I also have the soft start 912 uls and when I start the engine it takes a second or two for all the plugs to fire. Once they do no problem, is this actually what the soft start does?
      
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  • Re: 912ULS Startup

    by » 11 years ago

    Steve,

    The soft start actually does retard the spark for several seconds. Just like the old retard systems on antique cars.

    The spark is fired just past top dead center during startup. The theory is that when starting at very low RPMs, If the spark fires before the piston reaches top dead center, the engine has to work harder to push the piston to the top once combustion has begun. By retarding the spark, the piston is already past the top and starting to move downward when combustion occurs. This makes for much easier starting with no risk of kickback. A few seconds after the engine starts and is up to idle RPM, the spark advances to its normal firing position. That is why you get that low rpm and odd exhaust sound for a few seconds after starting.

    Bill.
      
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