Thanks for the information I will take a look and see what I can find regarding the jap boxes.
Plan was to run the bike with standard gearing first time out with a single 1 3/16" carb and expansion chambers and see how I get on. I did find a 5 speed gearbox drawings on the BSA bantam web site which I guess may be another rout to take. I have at the moment my hands full with getting the bike back together, I now have new bearings and seals, new crank shafts, conrods, barrels and heads which need machining, barrels are second hand form Draganfly. Still searching on ebay for rear dampers/shocks.
I have a question regarding the front forks, I have them apart at he moment and wondered if anyone knew what is the correct fork oil to use and how much to use?