I agree with Ed; don't use expo until you've been flying for a bit.

That 62 is going to be a whole lot of power for the Rascal 40. I had one I flew with a OS 48 and a Magnum 52; those engines were plenty of power for this plane. I had to put a glow driver on them to get a low enough idle for a good landing. Without the glow driver it took long approaches at idle to get the plane to slow down enough.

Good luck with your plane. I only have two words for you; throttle.. throttle.