I too have a newer setup F90 with Evolution 26 and pipe. After landing the head temp was 250F at 78F ambient temp. The play "eyeballed" was more than a 1/16 on an inch while still hot. It too had very little play after cooling. Running 18 X 6 wood prop. I have less than a quart of fuel through it with Mobile1 synth. 2 stroke oil. Is this normal? Should I be worried? The motor sounds great but I am concerned that this motor has that much movement on the crank when at operating temperature. Please, any input is greatly appreaciated.

-Dan