[Dave at Pelican Parts]

I'll let Raby address the cam question, as he's done about sixty zillion more hours research into cams than I have.

Oil viscosity tests and other oil tests are done at 212F, the boiling point of water. I consider that to be the oil's normal operating temperature. I consider 250F to be "too damn hot", and 230F to be "hot".

Run the motor. On really hot days, keep an eye on the temp gauge.

--DD