Hi Kye and Gadge
Yep, Gadge is quite right in the researching of the name 'Simplex'.
It was used on American and British machinery. For example, I have a
J.P. Simplex (in pieces).
I note that the manual refers to the 85cc as both a Mark 3 and
an 'LM' engine. I guess 'LM' probably stands for 'lawn mower'.
The 'V' might simply refer to a vertical shaft configuration.
Perhaps Gearco might know - or refer you to - someone in the know.
It's worth a try...
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Jack
