A friend has just has the gearbox fail on his sons Yamaha TY175, does anyone know of a company who can recodition or supply parts for this gearbox and how hard a job it is likely to be? Alternatively does anyone have a good condition replacement box? Whilst the gearbox is out we may as well rebuild the engine at the same point, which is the best UK company to order the serviceable parts from? The bike is located in Suffolk in the UK. Thanks in advance, Fergus