I have both the 18 and 20 HP kohler magnun all seems well but I worry about how hot they both seem to run. . The motor blower fans work great and the screen air duct down below is 100% free of debree. Seems as though even only after minutes of running the motor is to hot to even check the oil after being turned off. I know If a motor gets to hot it will not restart until it cools down. Both my motors restart instantly. I know and reailze these are air cooled and should run hot but is this normal to run that hot? Any help or thoughts would be more than welcome. On the 18 HP I took off the upper and side heat shields to see if that helped. Seemed to run slightly cooler. I've never liked the design of the upper heat shield that seems to trap in the heat from the very hot muffler. Bruce