As a guy that's spent a lot of years keeping engines running for a lot of people, this is one of my favorite engines of all time. It and the old Enya IV are just about indestructable. They can be be re-freshed with a ring and a hone job to be like new pretty much forever in my experience. The Veco chips in with great power, standard "inch bearings", and a chrome liner too. Rugged, simple, sublime... Oh you can start with a .281" inch hole in the vent.