The problem is finding an engine that is actually in good running condition....when the first one went out i bought a used one for $500 plus cost of replacing gaskets and spark plugs and ignition cables. I wont have to buy new spark plugs and ignition cables this time if i go the used route. However my used engine starting using oil almost immediately after install and started knocking even though I kept sufficient amount of oil in it. Plus I ran royal purple synthetic in it.