Two wheel worship

You may have seen this Video before somewhere (I might have put it on here cant remember!). I like it for the bike that the sensible race guy has. It is a B series BSA. Good sound as He bump starts that thing. It's a BSA "Special" ( that's what they called/call modified bikes, Now its changed to "custom" or the type of custom (cafe, bobber, chopper etc) And this film's from 59 apparently. Early cafe racer stylee!

 

BSA B series "Thing"

I would like to get more info on this mutha. It was on the jj. I see the front has obviously been changed. I whonder if the frame is standard BSA. I notice the stance is good. Despite the single engine being really tall the non standard fuel tank looks good, not all high up and awkwardly perched on the cylinder head like they usually do when I offer up a non standard tank to try.