Stupid question #1- By "backwards", what do you mean? Not knowing how long you've been in the hobby, I don't want to assume.

The propeller will be turning counter clockwise when it's operating correctly (although, now that I'm thinking about it, I'm assuming here that it's the same as glo powered motors).

Anyway, the easy test is to put a prop on it and see if it "pulls" when you rev it.

Good luck, I'm sure someone else will chime in here shortly.

Mike