I got these with a go kart I didn't need. Both have Tecumseh billet rods. Both engines appear to have very little wear. I don't think the second one has been fired yet. I have no history for either one.
Smoke stack article is a early H50 nothing like the star. Star was based off the 10 HP HM100 the H50 was a controlled stock motor meant to compete with the briggs raptor. it was far superior to the raptor.