Finished a Honda C50 engine (for my brother's C50), to make room for the CB400F engine. It's the spare engine, he's doing 10.000 km per year. After 20.000 km, I just swap engines, gives me time to do things in between other projects. After 20.000 km it only needed a re-bore and a valve job, new points and a new condenser. As an experiment I mounted a carburettor from a more modern C50. Mileage is around 60 km per litre.