27-08-13, 06:14 PM
Better start with the obvious I suppose: is the drive sprocket secure on the shaft?
If it's not the famous loose sprocket nut problem then can you feel any free play in the drive shaft? A knackered bearing on the gearbox output is fairly easy to detect.
If it's not the famous loose sprocket nut problem then can you feel any free play in the drive shaft? A knackered bearing on the gearbox output is fairly easy to detect.