I guess I'll comment since no one else has. I haven't run mine in years, but when I did, it swung an 11x5 just fine on a Jamison OTS model. And... that's probably the ideal place for one, a short nosed OTS model that needs a little weight up front, with a smooth run, and a reasonable amount of power, but not a stump puller. For instance, I'd put it in a Jamison or Viking, but not a Humongous, unless you can build super light... most Humogi' I've seen tend towards the porky side.
Chuck the stock muffler and get a chip, or it will bring your total weight up from 10.5 to 13 ounces!
Quips aside, it's a fine engine for what it was intended, and a great engine for $15! I think back in the day I paid $95 for mine??
EricV