I think its an 08 and by carb they could mean throttle body..
As far as my "oops" comment, I had had a few and posted in the wrong thread and then edited it out.
Thinks it's the magneto????? Sounds to me like guesswork instead of disgnosing briefly problem.
Carb ????
There is a sensor in the carb that regulates the air flow & another manual screw on the outside that is factory set this should be checked every 200 hrs