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   Post on 912 Carb Balance in Avidfoxflyers General Hangar

   By ChrisBolkan, posted 1 Apr 2013

   Can someone tell me why Rotax chose to set up the 912 carbs the way they do? My prior experience with carb balancing was with the 582. Very simple to balance, the procedures make sense, and the carbs stay in balance.
    
   Now I have this 912. Not flying it yet, but have helped a few freinds balance their carbs and what a PITA that is! Now I have one myself I am wondering if anyone can give me a good reason why not to set the carbs up to spring shut like the 582 and have the idle balance be set on the idle stops instead of on tensioned cables? What a mess the tension open scenario produces, and how easily they can get out of sync!
    
   Has anyone converted a 912 to spring close and cable tension to open instead of the standard spring open and cable tension to close?
    
   I figure the engineers who designed the engine know a LOT more than I do, but for the life of me I can't make any sense of why they would do it this way.
    
   I have heard that it fails full throttle instead of idle. OK great. But If that is the only reason, I'd rather have it fail closed throttle.
    
   What do I not understand here?
    
   Thanks!
    
   ChrisB