left cylinder misfire

First off thank you for clicking on my post to see if you can help, I really appreciate it. REALLY. So, the bike has a misfire on the left cylinder when rpms are between 1k to 2k. I have ruled out the following; Spark Plugs, Ignition Coils, Sparkplug Boots. What would you check next in...

Hello all, I posted a previous thread about getting a stuck oil emulsion bolt from an '82 XS400XJ DOHC Seca, finally got it off and replaced it and the oil/filter. I had the bike running pretty well after cleaning out the carbs, but I was in the process of doing the MSF course and let the bike...