Not owned one but a friend did in the mid 80’s
He decided to swap the engine for a better/larger capacity one – 1800 to 2000 if I remember correctly
As an experiment on the old engine, he treated it to SLICK 50 (an oil additive) then drained the oil and drove it for 50 miles to see if it would seize – it didn’t
He then put it on his drive and put a brick on the accelerator to see how long it would last – made an awful noise. Eventually the neighbors complained about the smoke and general din.
It never blew up
I was there
It’s true
Don’t know anything else about them
HTH
If I had a photo of a sparrow sitting on a pea I’d post it, but I don’t
Nigel