hey guys i have a 1983 xv750 have been told its the tr1 shape they made for japan they apparently have a size limit over there to the question it was running great then she desided not to run anymore blew some blackish smoke when she wasnt running proply just spluttered didnt want to move then now she wont run want to do process of elimanation but dont know where to start and dont know where to go can you help?