I've got extremely low compression on my ASP .75 Glow engine. It's so low that when i rotate the prop i barely notice it at all. The story, i bought this engine used and was told it was in good condition, when i bench tested it worked fine, except for a problem holding idle without dying. Well i slapped it onto my airplane and was having a lot of trouble getting it to idle without dying at the field, finally got it to somewhat cooperate and took to the sky. On climb out i pitched up about 30 degress and she died. I set the plane down flat in a bush field with only slight damage to the left wing, no big deal at all. When i found it one of the muffler bolts was gone and the other was still there, so i thought that was the reason for the dead engine, the muffler came off in flight.
I inspected the engine and saw no damage or dirt on the engine, spinner and prop, but the carb housing part was slightly turned to the left. I rotated the prop and no compression. So what's wrong? Can it be fixed without spending a lot of money? I bought the engine for $50.00, i'd hate to have spend a lot to fix it. Any help would be great, i fly mostly electrics so Glow engines are still kind of new to me. Thanx

Kyle