I assume that you mean when you try to diengage the clutch it doesn't. This may be siezed clutch plates or the hydraulics not working. I#'d check the latter first.
If it is the clutch, take out the gearbox and you will find the clutch bolted to the flywheel. Midget gearboxes aren't very heavy.
I suggets you get a Haynes manual.
Terry
April 2006