I'm guessing that engine is an HH60 6 hp Tecumseh-A great,heavy-duty,all cast-iron engine. I just rebuilt one on an old TroyBilt tiller this summer-all I had to do,other than cleaning it out real well,was put a new set of points and a condenser on it,and it was sparking strongly. The carb was totally gummed up,and that took the most effort to clean up (especially making sure the small passages were clear). A new head gasket,and I was back in business again. I found another HH60 off another Troybilt at a car swap meet a while back,and I picked that up cheap as a backup-I just hate the idea of putting a crummy Harbor Freight engine on a TroyBilt.