Spent a couple hours working on the snow blowers at church. Our Ariens had a slight surge at high rpms so pulled carb and cleaned it, also changed the oil.
My pastor found s 6.5hp craftsman sitting on curb last year and brought it to the church. Oil had gas in it so drained that right off, it was so thin, about a 3rd ran down frame and all other our barn floor.
I pulled carb, cleaned it and looked at plug, it was pretty black from being rich. There is not air fuel adjustment so not sure why it's running rich. I cleaned carb, filled with oil and it runs pretty good. So now we have 2 snowblowers for church use.