Hello Murdoch

A warm welcome to these forums.

Quote
I want to change the oil & I`ve read you refill it until it overflows
Does anyone know roughly how much that is ? I have a bottle of oil with about 400ml in it.
Yes - 1.25 pints, 21 ounces or 600ml.

Yes, the engine is a re-power.
Expert Mod BB would have a better idea with dating the machine.

An Operator Manual is here:-
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=64934

Hope this helps.
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Jack