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   Post on Carburetor issue. in Avidfoxflyers General Hangar

   By whizzers, posted 20 Jun 2020

   I have bought several engines from a reputable rebuilder, and for the most part am well satisfied. However: One of the engines I installed on my Avid/Kitfox Frankenplane had idle issues from day one. Lots of power and ran well, but I couldn't get it to idle smoothly below about 3000 rpm, and although I had the idle stop screws all the way in, I still had to add throttle to keep it from shaking the front off the plane.
   So today I decided to make a project out of the mess. So I tore the carbs off and disassembled both. Checked the jets and needles and set everything according to the manual. In the process of re-assembling the carbs to the engine I looked at the enricheners, which were still on the plane. I don't know why, since I don't use them, but I had to disconnect them to get the carbs out.. AHA ! The rubber bottom on one was worn clean through and the other was missing completely. Now I had a complete "new" engine still in the crate at home, so a thunder-run home to steal the enricheners. NO GOOD ! The enricheners on that engine were in exactly the same condition, shot !  Fortunately my ample junk box yielded a pair of manual enricheners in new condition, so in they went.
   The engine now idles at about 2200 rpm, and I had to re-set my jet-needles. Also in the process I found the carb boots to be bell-mouthed. In fact it shook the carbs off the engine twice, and no way could I get them tight enough. Fortunately I had a new set.
   Point is, the guy does a marvelous job of rebuilding the engines, but the quality control on the accessories is somewhat lacking. In fact I got one set of carbs that had different jets in one. A few minutes checking might save you a lot of headache.. If I hadn't accidentally checked those enricheners or if I had just thrown the "new" carbs in complete, I'd still be scratching.
   Too soon old and too late smart
   Bob McCaa