RE: YS 120 AC
Dave: Can U help? I have a used YS 120 F that I recieved from an associate. He stated that it has been run maybe 1 hour flight time. It does sound good, "However" upon trying to fine tune it, I can shut off the mixture control completely and it will still run at full rpm and on high idle. When I go to idle at approx 4500 RPMs, it slowly comes to a stop. if I increase the throttle, it dies immediately. I have tried to adjust the idle adjusting screw and find that it will operate at 1/4 open from the closed position. As long as I leave it on high idle approx 5500 RPMs it runs good with no ill effects. I don't know too much about YS but it seems strange that given the cituations, I would think that the low and High mixture controls are not right. This is a closed system with new lines and no leaks. I am useing Excalaber 25%. I have also removed the Idle adjustment screw and the nipple looks good and the aera clean. I am running a 16 X 6 prop and the bird flys great as long as I am on high idle. I sure would appreciate some help. Thanks.
Ron