Been running the mods I listed. I have been adjusting pilot screws back and forth, to get things just so. I wound the bike pretty tight a couple of times yesterday and it kicked like a mule at 25 mph in first ( rev limit kicks in at about 35) Too rich. I have ridden a total of 250 miles in the past couple of weeks and yesterday I did 200. When I got home I pulled the plugs. Sooty black in places. Pulled the carbs, remove the washers. Left the jets. One and one half hours later... Took it for a spin. No bucking no kicking, winds "really" fast now all the way til the limiter shuts it down. If this changes I'll update. Every time I say that the sputter is gone it comes back. So this time I won't say it. However it hasn't stalled the bike since I did the mods and I noticed that most of the time it does when I am coasting to a stop on a long roll and I blip the throttle to down shift.