On the O.S. Max .46 FX, we regularly run APC 10 x 7 props. This won't hurt your engine at all. A lot of people run 10 x 6 props, but that's a tad small, but the engine will still handle it.

Overheating would be caused by too much propeller, a fuel with a too-low oil content, bad cooling, and bad needle adjustment.

With good fuel, you should have no problems with a 10 X 7 prop on your model. Just make sure it gets plenty of cooling air and you're using a good fuel.