I've recently noticed development of a single sputter and stumble on my '07 when I roll on the throttle while cruising in third gear and sometimes in first on takeoff. The bike sputters, stumbles then accelerates when this occurs. I'm running with a 130 main jet, 4 shims on the needle, pilot screw 2 & 3/4 turns out and the bike was running STRONG till now. I just pulled the snorkel last night hoping to give her a little more air as I'm pretty sure she's running rich once this stumble developed. I was thinking I should back off 1 shim and see what happens but I know you guys know a lot better than I do so here I am. Should I be concerned about any other possibilities here? What would you guys recommend me trying? Thanks all, I know I can get this straightened out quick with your collective help and extensive knowledge, good to be back! Hopefully I'll have a hollow mod pictorial to come soon if time allows!