I put some skis on the plane today and tried to fly. I could not keep the engine running no matter where I set the low and high speed adjustments. I fiddled with it for about an hour and gave up. Later I took a hand operated air pump and hooked it up to the muffler. I sprayed the engine, lines and muffler with soapy water, then put some pressure to it. I found two leaks. One at the idle speed screw. This doesnt concern me because I can just plug the hole. The second leak which is the worse of the two is at the throttle barrel on the carb. It leaks all the way around. It has to be sucking air when running. Is this normal ??? What would you do to correct it. I looked at the parts diagram. There is no o-ring for the barrel. How is it supposed to seal???