I've seen the "running hot" or more often "running too close to the red" on my own BX2200 and 2 others. All had their air paths blown out very thoroughly with compressed air & more than normal attention to radiator screens, inlet grilles, etc. Also flushed radiators. It becomes more noticeable on the one in Louisiana when the outside air temp is at or near 100 degrees. My belief is that the water pumps are undersized on these small 3cyl engines. Reason I say that is (with all cleaning, blowing, clearing, etc.) the radiator itself is plenty big or maybe even oversized for that little engine. I have also seen people pull their thermostats out which did not fix the issue. Nothing left in my mind but that the water pumps are just marginal capacity. Not quite enough water flow to be as forgiving as I think they should be.