I don't think they had an inductive pickup for the tacho, so they just ran the road speed as a 5th gear roll on. If you can point me to a table of gear ratios, I can work out the conversion for my sprockets.

Any ideas what the flat bit is just where the AFR starts to drop (around 130 k/hour)? Any comments on the AFR?

Oh yeah, I've been starting it like that since I got her cos there's no kick starter. You've got me worried that I'm going to knock her off the stand now! Any other suggestions that don't involve me running down pit lane pushing it?