hhmm....This sounds like a good possibility.Unfortunatly I didn't buy the engine new...The guy I got it from on ebay did.It had never been started when I got it.And after about the third tank it ran great....plenty of lift....Then the last tank and a half it just wont get off the ground once its warm...Just slides around on the ground

Think theyd swap me an engine?I dunno....maybe I'm jumping ahead
Joey