I have a Prairie 650 that seems to be running rich in the low and mid range. It carbons up the plugs and if you ride at the 10 - 25mph range it sputters up and down, like it needs to be leaned out some. Has anyone else had this happen and if so what did you do. My dealer is looking at it right now but this is the first one they've seen do this.

 

How's your air filter?
Check your choke yet?

 

There is a problem with the choke cable on the 650. I had to have mine adjusted