Welcome - great name !!!First...welcome aboard. My Rebel cmx 250 is a 2002 that I purchased for my wife several years ago, the only issue that I've had with it was a symptom just like yours. My first thought was the problem was "temperature" related which led me to the coil. So, I put some spark plug removal tools & gloves in my pocket & took off, when it failed I pulled over, pulled out a plug, connected it to the coil wire, laid it on the head(for ground) & spun it over. Sure enough...no spark! I had an extra known good spark plug in the saddle bag so, stuck it in(it was cooler), damn if that cylinder didn't start firing. limped it home on 1 cylinder, changed both plugs, problem solved, but mine prefers an NGK plug. You might check your spark @ the plug during the failure, it's easy & costs nothing but a few minutes to do.