Had a D1 Bantam myself – I got over it though
Haynes still do a manual:
https://www.haynes.co.uk/inc/viewbikemanual.asp?mt=0117
You can also get every thing you need from here:
https://pages.eidosnet.co.uk/~canddautos/
Top tip : the electronic ignition conversion is well worth the money.
hope this helps
Katana