I pick up a Troy Built Pony rear tinine tiller. Got it for $10 because it had a blown engine. I got the same engine for it $20 running. I changed out the engines. Now that I have the engine on and everything the way it came off the other engine Im having some troubles. When trying to till it pulls me across the yard. Thats with the tinines running forward. Why is this? It even does this with dirt that has already been tilled up. I have watch youtube videos and seen you can till up unbroken ground with it and it not pull them across their yard. Please help need to get my garden going.