Hi John,
Ya it def a major challenge,
, good to know someone with a similiar bike, if you can call mine that!!.
The seat on mine is not original like most things, i would imagine the original is the same set up as yours.
Not sure where to start to be honest, looking for guidance, would appreciate any information you could share, especially sources for engine/gearbox.
I'am living in Ireland which makes access to parts even more difficult.
Nice to see a picture of your bike if you have one.
Kind regards
Alan