I did my 200 hour service today with a Rotax repairman. Most of the work was simple and I had actually done a lot of it last fall during my annual but I wanted to see if I could learn a few things from him.

I had noted roughness in my engine at different rpms and it seemed to be worse at about 3000. We noted that a few plugs were darker than normal implying rich running. We dropped the carb bowls and found that the floats were riding a little too high causing the fuel level down there to be above normal. They were adjusted and things really were smoother before any sychronizing was done. Also, my plug gaps were a tad too large and they were remedied. I am surprised at how much smoother it is through the whole range. I was thinking a needle position change was in order but not the case.