I can hear the "blip" in the audio, but I'm not sure I know where the sound originated on the bike. Can you explain more what you mean by blip? Is this a pop through the exhaust, the carb, or something else entirely? I've seen you use the term elsewhere and just want to make sure I understand.
It started out as just a slight, single misfire which is why I called it a "blip", barely noticeable and rideable right through it. Later that day on our way to Chris' house and then Bike Night it got worse, misfiring a few times in a row but still rode right through it all the way up to redline. Figured it was just a slightly fouled plug, I know it's still running a tad rich and thought it was just exacerbated due to the higher altitude I was in at the time. Last week I put a lightly-used set of plugs in it, known good ones taken out right before the trip, and it's just the same. And the longer I ride it the worse it gets, to the point of it popping badly out the exhaust of one cylinder though with the pipes that close together underneath I can't tell which side. Won't rev out anymore, runs so poorly on that one cylinder it's unrideable though it revs out normally when not under load. Time to go through all the ignition parts, pretty confident it isn't the battery but of course I'll check that too. Been busy with life (battling diverticulitis, working on wife's greenhouse off and on, and other distractions) so I'll get to it as soon as I can. Weather has been weird here for the last few weeks, colder than you'd want to ride for a few days, then warms up and rains, then back to a cold front again.