Look familiar. 1953 model.
Do you have the exhaust/muffler still ?
Hiya,
I have a muffler for it but it's a tiny bore, I suspect its for something like a 97cc engine, there is a collar screwed onto the barrel and that's it unfortunately.
I'll get some better images of frame numbers a soon as I can, thanks everyone for helping me, I really didn't know if I'd get any responses and the info so far is great!
Can anyone provide info (even just rough) on how many of these there are still in existence and any Sun owners club? I'm very new to the world of vintage bike ownership and am still to start on the rebuild path, I have a rusty VW bus on my driveway to finish rebuilding first