I guess they are run in, but these have chrome liners and you don't completely break those kinds of engines in with just a few flights. The ones I've seen also have a fair amount of pinch too.

I have a .455 and a .46NT myself, and both are great little engines. The .61 and 1.00 engines did ship with o rings missing in the carbs for a spell, but that is easy to fix. From what I've seen on those 4 models I mentioned, they all need a hotter plug than the OS 8. The OS A3 does wonders with them. The .455 and .46 responds well to the Towers muffler too.

First thing I would do with those engines is to take out the OS 8, prop it right, and then see how it performed.