Hi Chris,
Bernie has given an excellent description of Bibax and the sprung friction disc. At the moment, though I know I have a twin-plate clutch, I don’t know if the plates are ‘Sprung’ My next move is to try Bernie’s suggestion of looking at the ignition timing. With luck that may be all that is needed to fix the problem. Otherwise I will have to have the gearbox opened and examined – expensive!!
Bob