I had the carburetor on this motor rebuilt about a year ago, due to extreme starting difficulty. I ran it once to test it, just at idle, (ran the carburetor dry at the end of the test) and then didn't use it again for a year. I didn't test it's ability to continue running when put in gear, at that time, just started it up, noted that it started and idled much better than before. Now the engine still starts and idles quite nicely, but when I shift it into gear...it immediately dies. If I rev up the motor before shifting into gear, I can occassionally get it moving, it runs at fairly high speed for about 30 seconds, then dies anyhow...like it's running out of fuel. Ideas????