I wish I could have done a more scientific test because that is what we are all craving, but I got lazy and did both things at once. There is a HD shop with a dyno nearby, and a 1/4 mile track. I'll try to get it tested eventually.
'09 CR 20K miles. K&N, Race ECM, and a Barkers. I added 1oz of 2-stroke oil then filled it up to get it mixed. I have never heard my fuel pump before and I don't now. The seat of the pants dyno thing is really pointless without a concrete 'before' test and 'after' test. Sorry I couldn't provide one. It does however seem… smoother? Relative I know, and I tried real hard not to have a preconceived notion, but I unwillingly think about it when I ride. Like an "A-HA" moment.
I changed my oil to H-D SAE60 because South Floriduh won't drop below 80* ever, for the next 6 months
Right away I noticed the top end got quieter, and maybe quieter from the exhaust too? It's alway been real loud up there, even after the last valve adjust. Now the valve train is much, much quieter (still loud enough to scare babies, It IS a Buell!). That make sense with the higher viscosity. I'm sure it has higher oil pressure too. When the temps drop below 75*, I'll change it to 20w-60.
Another big change is the coolant temp drop! My CR would be very consistent at 94*-98* above ambient as read by the IAT (typically running at 189*-201* coolant temp). Now it is 85*-89* for the last week! (180*-192*) (I never recorded idling at stoplights). That's a HUUUUGE change! The change was immediate and my inner thigh gets a needed break! The coolant fan actually cycles now vs. running constantly.
Thanks Gloomshadow for starting this. It got me off my butt to make a change that I'm happy with. Even if the 2-stroke oil doesn't do anything, It can't possibly harm anything unless it's way, way overused. I'll keep doing it.