Table of Contents

Introduction; The Unit Single saga; Unit Single quick stripdown guide; Preparation of aluminium castings; Lubrication system; Main bearings; Crankshaft and conrod assembly; Timing side; Gearbox; Kickstart mechanism and outer timing cover; Primary drive; Cylinder and Piston; Pushrods; Cylinder head; Rockerbox; Engine breathing; Electrical system; Carburation;m Life with a B40; Specifications; Exploded engine drawings; Appendix: Rupert Ratio engine stand; Index; Updates

About the Author

Rupert Ratio is a long time contributor to The Star, the magazine of the BSA Owners Club, and technical consultant on matters relating to the BSA Unit Singles. Under his real name of David Smith he is a design technology teacher by profession.