New to the forum and am buying a 1993 CBR 600 in perfect shape. The only problem is that it isn't running smooth right now. It turns over fine. The 1 and 2 cylinders are firing fine but 3 and 4 are not, but they are getting gas. It seems like a simple fix but I am not sure right now. The bike is in such good shape I was just curious if anyone has ever encountered this problem.

 

Plugs and plugs wires I know you've checked. Those specific ignition coils could be out. And you're 110% sure they're getting gas?... Carbs seem to have been my problem for almost everything.

 

That's unusual, as 1 and 4 cylinders use the same coil, as do 2 and 3. Unless the sparkplug wires were crossed. So you have all four sparkplugs in the correct plug wires and laying on the valve cover. When you crank it over, only cylinders 1 and 2 fire, so sparkplug wires 1 and 2 are good, as are both coils. If all four spark, the sparkplug wires are crossed. If only two fire, I would take sparkplug wire #1 and put it in the coil where sparkplug wire #4 is, and put sparkplug wire # 4 where sparkplug wire #1 should be and see which sparks. Do the same for 2 and 3. Then get out the voltmeter to see resistance in the wires. Perhaps a resistor in the wires is bad.