The engine appears to be a more modern replacement.
The problem with this chassis is that it was used for such a long time,
spanning the 1960s and 1970s.
The design started life as a mainstream domestic lawnmower, but
ultimately became a specialised 'utility' lawnmower.
It was used with many engine variants, 2-stroke and 4-stroke.
I have records for Kirby, Tecumseh, Villiers and Briggs engines.
I do not have records for your one.
The engine on yours is, I think, a more modern Tecumseh
Honda , never
used on this chassis. This is not certain because ...
The other point I make is this.
As Max said, this is Supa-Swift ... but - I add - with a twist.
The lack of that name cast in the base indicates that this was probably
a store brand. Supa-swift marketed this machine under their own name
and also as a 'Tudor'. At some point, the base would appear without a cast branding name.
I suspect this is one of those - sold as a store brand.
Have a look at this brochure
:-https://www.outdoorking.com/forum/u...ft-brochure-1966-67-range.html#Post59883Hope this helps.