#4 not firing

So, the last time I started my bike I noticed that the far right side (I believe that's the #4 cylinder) wasn't getting warm at all where the far left side was at normal operating temperature. If I'm not mistaken, #1 are fired by the same coil. Anybody got any Ideas?

Not an expert, others will certainly join in, but since I stumbled across this first... :whistle:
You are correct in that 1 & 4 fire off of the same coil. 1 is firing but 4 is apparently not...need to verify...pull plug, reinsert into cap, ground against block, crank her over & look for a fat Blue spark at the #4 plug...No spark? Assuming plugs are all in good order (not fouled, correctly gapped, &c) , original plug wires? try cutting a 1/4 inch off the plug end of the #4 plug wire, and re-threading the cap back on. that can fix it sometimes ..not too much exists between the coil and the plug...check wire & cap separately for continuity(mainly) & resistance...See fat Blue spark at grounded plug? sniff plug/cylinder..if it smells like gas, could possibly have float level too high in that carb...essentially "drowning" spark (Flooding that cylinder) Like I said, others will certainly chime in, but there are a couple thoughts for ya...Good luck!

Switch the plug wires 1&4. If #4 still does not get hot, you have dirt in the #4 carb.