Seek help by boffins: Mentioned bike has clutch/ clutch related problem: when clutch cable is pulled in (cable as necessary play) and gearbox in neutral and bike is started, as soon as bike is put in 1st gear, drive sprocket pulls forward / kicks forward for small distance BUT causes nuts on rear comstar wheel to cut grooves in rim. Is clutch not disengaging ? Is gearbox the problem ? Thnx. Poen