The first ryobi I converted gave me the same problems you're having. Worked on the test stand, but not in the plane. I found I had to raise the tail of the plane till the fuse was level. Full choke, full throttle, ign. off and turn over engine with elec. starter for about 3 seconds. Drop the tail, throttle at 2 clicks above idle, ign on, fires right up with starter. That is pretty much my starting proceedure for my gas bandito now.
Edwin