You will find mixed reviews on the engine. Since it is a .65 it is a Sportster which is a plain bearing AAC engine. You need to get your hands on a manual. Proper break-in is important. I had 2 of the .21 sportsters in the mid 90's and I found them to be outstanding engines for the money. I also had a .61 which was a great engine. I wish I hadn't sold it.... oh well. Good luck with your motor!