2006 honda shadow 1100 cylinder problem?

this thing only has 162 miles on it. the front cylinder has no combustion (or at least not steady combustion). here is what is going on. carbs were varnished and totally plugged up. removed carbs. disembled soaked over night clean all ports and reembled correctly. drained tank. put in new 93 octane along with sea foam. reinstalled carbs and bike fired right up where as before it would not even start. now it is missing on the front cylinder. dont know if it was missing prior to the work i have done cause it aint my bike. so with the bike running i can remove either plug wire from the front cylinder and there is no change in the way it runs. i can remove both and it keeps running and still no change in the way it runs...(note it skips continuously not just when the wires are removed). now i can remove both rear plug wires and the engine will die. now i do know it is getting fuel cause fuel is on the plugs when i remove them, it is getting spark, and it has 160 psi of compression. it sounds like to me there should be combustion happening. now that other odd thing is that while running about every 3 or 4 seconds there is a back fire and blue flame in the exhaust pipe of the front cylinder which leads me to think it is combusting occasionally. hope u guys can help