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     1. 08:24 PM - Carb sync issue, Another thought provoking problem (Roger Lee)
 
 
 

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Time: 
08:24:19 PM PST US
Subject: 
Carb sync issue, Another thought provoking problem
From: 
"Roger Lee" <ssadiver1@yahoo.com>
      
      
      Hi All,
      
      Another mind probing problem and Ill give the answer in a day or two after a few
      tries at an answer.
      You just pulled the engine for the Rotax 5 year rubber replacement maint. Everything
      is back on, oil purged and new plugs. Its time for the carb sync. You do
      your mechanical sync and head out to run the engine for the pneumatic sync. You
      start up and everything looks good and the gauge needles at idle are only 1
      of vacuum off and the idle is 1750. You throttle up to 3500-3800 rpm to start
      the high rpm sync. The needles here are 4 of vacuum off. So you adjust the bowden
      cables to sync the two carbs and you run out of adjustment. You shut down
      make a cable length adjustment  on the throttle arm and restart. Now the gauge
      needles at idle are 7-8 of vacuum off at idle. (Frack) You try and try to get
      them closer, but the left carb doesnt seem to adjust. The engine is running
      rough and is now down to 1620 rpm. This particular plane has a Dynon D120 EMS
      with all the temps available to you. Oil temp, CHT and oil pressure are good and
      normal. The EGT temp span warning is flashing yellow which means your EGTs
      have a span greater than 120F and thats about where they are. One EGT is 1050F
      on #4 cyl while the other is 900F on #3 cyl. You just cant seem to balance these
      carbs.  Frack
      
      NOW WHAT AND WHY?
      
      
      By the way these thought provoking problems I give are real problems that had a
      particular solution. I post these in the hopes that some day if you have something
      similar you may remember and find a quick  and painless solution.
      
      --------
      Roger Lee
      Tucson, Az.
      Light Sport Repairman - Maintenance Rated
      Rotax Repair Center
      Home 520-574-1080  TRY HOME FIRST
      Cell 520-349-7056
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=339729#339729
      
      








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