OK, a relatively new engine will NOT idle at it's minimum speed until it's been fully broken in and loosens up. Secondly, if you are at the minimum throttle setting before it quits it MAY be too rich. OS tends to ship a bit with the idle a bit on the rich side to protect the engines. Again, the engine needs to be almost completely broke in before adjusting. How much has this engine been run in terms of gallons/tanks/hours or whatever?