I am now at wits end with this engine and am afraid I will have to return it to BME for repair. I have examined every part of the carburetor except the small jets behind the Welsh plug. I have no idea how to get that out to look at it. All other orifices are clear. I cannot conceive how this is happening but it is. The other thing that is strange is when I put the choke on it won't draw fuel through the line as I turn the prop over. As soon as I put my thumb over the air intake the fuel shoots right up to the carb no problem. Since I can't see any obstructions in the orifices I am now beginning to think there is a major air leak somewhere. But where are the failure points on this engine? This is starting to piss me off cause how can the thing run great two times and on the third flight develop a major air leak? Any one else having this kind of trouble?