I have an older Toro ZTR with a Kohler Command in it. The engine is blown. Can I replace it with a Kohler Courage with little hassle or will I have to get new wire harness and all that? I know the Courage isn't as good of an engine, but considering the age of the Toro I really don't want to drop big bucks on an engine. This is my backup I mainly just use for my house anyway.