There's been a lot of new members here since you joined in September, Ive lost track of the history of your 650 (unless I go back and search all the threads you posted to)
How much have you rode the bike since you got it? The video shows only the rear muffler spewing smoke, and the smoke at the head connection continues after you stop the engine.
So there is either oil or gas in the muffler, and oil on the head connection point burning off.
Have you recently worked on the exhaust, maybe spraying PB blaster on the studs and nuts to take it off or torque it down?
If this is the first good long ride you have been able to put on the bike yourself, I wonder if the rear cylinder could have been running rich before, or if oil got into the exhaust some other way.
Another thing to check out, make sure the choke on the bike has not gone wonky on the rear carb, keeping it choked while you are riding.
Time for some good news: if your rear cylinder tappet cover is leaking oil and causing all this, it is the only one of the 4 tappet covers you can get off without taking the carbs off the bike. You will have to remove the tool compartment plastic cover, and maybe the battery compartment cover, but you can get a 10mm box or open end wrench on both bolts, take the tappet cover off and replace that one Oring.
Dont go nuts torquing it back down, its an o-ring so its either going to seal or its not, and then you will crush the tappet cover if you keep wrenching on it.
Last edited by KCW; 02-03-2019 at 07:24 PM.