That funny wce, I just picked up a Sunbeam Lawnkeeper 160 (of a roughly 1972 vintage) on Sunday from the tip.
Looks like a deceased estate - like it was used regularly and cared for, then sat for a year or 2 before being thrown out by the family. Other than the decompressor in need of a rebuild, and needing a air filter housing, it started easily without touching the carby or points (will be done next). Hope your ones are as easy to get going.
I was wheeling it through the tip car park, and it didn't rattle or jitter, just sounded near silent and rolled perfectly smoothly. It was when I went to lift it into the car that I worked out why - it is made of bloody thick alloy and weighs a tonne.
Another guy was loading a 10 year old steel deck Victa with a 375 Sprint Briggs, and he picked it up easily because it weighed nothing.
They certainly made them better back then