I just got an FL 250 in pretty rough shape. I plan on getting it running pretty good. It starts, but will only run with the choke is on. When I turn the choke off, it runs for about 5 seconds and then dies. Any Ideas? I am hoping it is not crank sealls I was thinking a worn out air screw, bad gas, bad fuel petcock....I changed out the fuel pump and fuel lines and cleaned the carb so far it still runs the same. Help!!!!!!!!!!!! I already looked at the manual. Thanks