My Shin T-230 has decided not to start. It is a year and a half old and I have had no problems with it before other than gas coming out the air cleaner when it tips sideways in the holder on the trailer. When I try to start it know most of the pulls it doesn't fire. Sometimes it does but only two or three times and then stops. I pulled the plug cleaned it, pulled the muffler it was clean as was the exhaust port, pulled the carb and cleaned it with choke cleaner. I don't know what to do other than replacing the plug tommorrow. There is a thread from last year a couple of guys had similar problems then they had to start replacing the plug every week or two to get it to run. Any of you find out what the actual problem was or how to fix it without replacing plugs every week?