Sort of confusing. You bought a used 46 you stated, never run in box, that then makes it not used? Anyhow I have 2 of them and they are excellent. They start easily lots of power and idle better than any I have. As has been said it will be worthwhile for you to bench run it if for no other reason then to get familiar with it. It may take a little to get it tuned properly but once it is it's great. You may find it desireable to remove the stops for finite adjustment of throttle.