This particular "Supercut" in question was originally fitted with a BSA engine, (note the odd engine mounts and the rare air filter snorkel). Definitely not the most common engine on a Scott Bonnar but it was a part of the Scott Bonnar line up and thus makes it part of Australia's Mowing Heritage.
Cheers, BB
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.