Hi, I've been around for a while but haven't logged in in so long that I had to make a new account. Anyways, I was looking for some help with this new engine that I put on my little Husqvarna zero turn. I bought the engine off of a guy yesterday and heard it run, started right up and ran great. But today after getting everything hooked up on my mower, it keeps spitting gas out of the top of the carb and once you shut it off it doesn't want to start back up. It just keeps spinning and you can see a white vapor (gas?) coming out of the exhaust. And then when it finally does start up there's a nice cloud of black smoke. So yeah, don't really know where to go from here. New spark plugs and air filter, but same issue. Any ideas?