CBR650F Running on 3 cylinders upon starting

[Ridenphd]

I have a 2018 Honda CBR 650F with 14000 miles. I purchased it when it had not quite 9000 miles. I have only used Chevron gas in it. Has ran great up until very recently. It just started to run on 3 cylinders when I start it. I know this because the second exhaust from the right is barely 100 deg when the other 3 are approaching 150 degrees. Then when I take off it stumbles a bit then runs great, meaning it is running on all 4 cylinders now. I know it has its own on-board diagnostics. It is not displaying any codes at all. I do smell the raw fuel when I am sitting on it warming it up, so that tells me the fuel injector for that cylinder is working. I have not done anything as of yet, just want to get other people's feedback.
My first thought would be the plug in that cylinder not firring. The other thought is the coil, but I know it has 1 coil for 2 cylinders, but could 1 side of the coil go bad?
Any thoughts?

 

[miweber929]

Could be coil or most likely spark plug lead or cap on that cylinder.

 

[Ridenphd]

I replaced the air filter, spark plugs and checked the valves (all valves were in speck at just over 14000 miles.) Put all back together. Runs awesome on all 4 cylinders now. Have to believe it was a bad plug, visually they all looked great though.