Purchased a new Exmark 21" Metro BBC with the new Kawasaki 6.5 engine on 03/25/04. While using it on 04/09/04, engine began to smoke and quit running. My wife delivered it back to dealer where purchased that same day. The following Monday I was informed that there was a blown head gasket. A new type of head gasket as been developed for this engine (so I have been told). As of 4/17/04 the new part has not been received. Even though this is covered under warranty, should I order an additional head gasket and keep on hand or will this part be more readily available soon? Have run the Kawasaki FC150 on another 21" BBC for almost 7 years without any major problems. Hope this engine will perform as well.