Emergency Engine Oil Seal Machining Repair TY175 Trials

Opening up a badly worn output shaft oil seal bore to next size up as an emergency repair with the engine fully intact. The only other option was to fully split the casings and have the bore welded and then re-machined. This method worked great and the bike is back being used in competition. We used plasticine to block the bore and prevent any swarf from getting into the output shaft bearing or gearbox.