RE: Plug gap
I agree with Jim it should fire it fine, but stranger things have happened. My DL50 will run OK with no misfire at .025" but it turns a tad more rpm's at .022". My nephews DA50 will misfire only at full throttle with a gap of .025" much like you describe. I've seen other DA50's run fine at .025" so I'm not sure what gives here. I just run mine at .022" to .023" and all is great in model airpane world from my point of view.