Phew , I got sick of looking web images and kept getting side tracked.
I 'm with you on the 1911 due to the shape of the tank WW.
Was thinking Tri but the tank rear is sharp.
http://www.barnstormers.co.nz/wp-conten ... umph-2.JPGStill the paint is different in the pic supplied, motor does look more BSA as stated.
Perhaps give Barnstormers an email they may be able to help with i.d?