Since most engines will accept a variety of mufflers, the 'TG' on the muffler probably doesn't mean anything relavent.That and thefact that I can't find a TGengine searching the web. There are no other markings other than the ones seen here in the pictures so the '44,47' etc doesn't do much either. On that thought, If I squint my eyes the figures in the casting appear to be SK or KS but I can't find anyting on either that would aid in identifying the engine.
It's a mystery to me. I thank you for the efforts though.