Got the vertical hit and miss and it will not run. Got it to fire off once for like 3 seconds and that was it.

What I did notice it spits fuel out of the fuel tank vent and carburetor. How do you tell if it got spark, short of pulling the spark out. I did turn it by hand and hear no arc pop or flash like the horizontal engine.
I read on other posts where users would use one O ring on bottom groove and it ran. How do you get to the O rings on this engine? Take off head and or cylinder?
Also does this take 2 AA batteries and dummy or 3 AA batteries. The ignition module seems to be the same as the horizontal engine.
And last but not least I have these engines and they do not run right out of box. Very frustrating.
Thanks, Rich.............