I have an Ozark 250 and I was having problems with it running correctly. I let it sit too long and the carb seems to have gotten gummed up. I cleaned it and got it running better . It will run great at normal driving and wide open too. Idle seems to be the problem . When I slow down to a stop it idles very high, so I adjust the idle screw down and it comes down to a normal idle and stalls. So I start it again drive it a little and stop again it idles very high again and I try to adjust the screew again and it does the same thing. Can't figure it out? Should I just keep running it and hope it cleans it self out? I adjusted the idle air screw with no success.