Idle

[Nat Penton]

George the increased idle speed is not a result of a fuel supply condition. You can land two minutes after takeoff and still have the problem. It results because the pressure drop in the carb cools the barrell more than the case. This results in a poor seal and the carb looses some ability to controll the airflow. The barrell and the case operate at sub ambient and the barrell is somewhat insulated by the oil film creating greater differential temps.  Insulating the case might keep the differential temps lower. Also a steel barrell / alum case might prove beneficial. I'm running the Perry carb and getting improved performance in the above regard.I think once this problem is solved we can get appreciable braking from the two stroke. Collectively we can find a solution and/also prevail on the manufactures.               Nat Penton
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