I did a successful upgrade to the bike via the jetting (pilot and main, along with air/fuel screw), air filter and exhaust. Bike notieceably runs alot better and not the dreaded warmup times. My only question is that after I run the bike for a while and twist the throttle very quickly while idleing, I still get the cough, sputter, etc. What I did notice was that the mods recommended here on the site said the fuel air screw should have been 1/4 turn out from bottom in stock form. When I did drill out the plug, my stock setting must have been 1-2 turns from the bottom easy. I buried the screw and backed out 1 full turn. Based on my description above, will turning out another 1/2 turn help my sputter and coughing when I quickly twist the throttle? A "normal" turn of the wrist is fine, it is just when I really twist quickly.