I have an 06 SM610 and just love the bike - except for the stutters it gets sitting on a constant speed (not under load). It feels like the engine is missing. I have had the bike to a specialist high performance motorcycle tuner and after $150 still no real improvement. He played around with needle positioning etc. Does anyone know of a solution ie do I change the jets and needle or what? Any advice or help would be greatly appreciated. Awesome bike I gotta tell ya!