2012 tw 1700 miles. it's always been the case that if I open the throttle just a teeny tiny little bit when I'm cruising in 5th gear then I can feel the engine kind of sputter and slightly hesitate----say 1/20th open throttle (my hunch, not measured). now, that hesitation zone seems to be getting bigger---say 1/8th open. I hope that description makes sense to someone. can I adjust the throttle somehow to fix this? is it something other than the throttle? Am I crazy & nothing's wrong? haven't touched the carb at all, everything stock. thanks for your time & expertise!!!