Hi Bax,

Need some help setting up my OS 91 FS. Mounted upright in a Lainer Dart. New glow plug and fresh fuel. Starts great with good solid high end. I am having extreme difficulty setting the idle. I reset the low end needle to factory settings then adjusted from there. While running high idle, it runs great. Trying to get low idle (slow enough to control at taxi) it sputters and dies. Does not matter if glow igniter is on or off. This is a used engine out of a 1/4 scale cub. Side mounted in that. No problems then. I have gone through about 3 tanks of fuel trying to adjust the idle mixture with negative results. If I can get a reliable idle, the dart will take its madain flight. Please help this 4-stroke novice. Thanks.