26/09/2026
1950 AJS model 20 cylinder restoration (part1).
1. Typical as-found cylinder
2. After sandblasting clean. repair broken top fin by brazing. Machine top face to ensure a good gasket seal
3. New copper gaskets don't align very well and will need adjusting. Cylinders need pickling in a mild phosphoric acid solution to stop rusting.
4. Wire brush surfaces to remove powdery phosphated oxidation. then mask off the machined surfaces.
5. Etch prime bare cast iron and let cure for 48hrs (min) in preparation for enamel top coat.
Part 2 - Cylinder hone and final enamel coat