Compression? ...engine turns over but will not start??? = How fast a spin are we taking?
Fuel? ... Gas is 3/4 = Like BW stated, we have gas, but is it flowing to the carb/pumped to the injector?
Spark? ...strong battery......good plug wires....all other electrical working?????? = Plug and other electrical is what? Do we have spark?; then go look with an old plug or get a shock holding the plug wire off the spark plug: that's what is missing is spark if comp and gas is there.
Walk up to the bike with a used spark plug, connect the lead and ground it to the head. Is there spark or not?
It's just the 3amigos and one is a bandit not starting things. Who is it?