Mephisto is a good engine over all with all the goodies that people want to have like OS engines. Its overly smooth on the bottom in my opinion which if you run it with the right pipe and clutch setup its still very good. Has a lot of pull for long straights and the head keeps the engine really cool. Over all its a good engine, but there are plenty that are cheaper that will perform better is my thoughts. Depends on what you want.