Longshot......
If you are getting spark on both cylinders and you have fuel, the only thing I can figure, other than a mechanical issue like a burnt valve which would show up on the compression test, is timing. Pull both plugs ground them and spin the engine over. Try to see if the spark alternates from side to side. I don't know if it is possible but given the fact that you have spark and fuel, then it must be firing at the wrong time?
I'm assuming you have switched your spark plug (hasn't been mentioned in the thread).
