Thanks Pete - I remembered that your Masport had a D series engine. They look extremely similar to me in general layout. Rather a complicated design, but you could as easily say "advanced" as complicated, with the reed valves and the centrifugal automatic ignition advance. Can you give us dates for the A and B series engines, and whether they had the reed valves and automatic ignition advance?
Next time someone says Victa invented the rotary mower in the early 1950s, that is just one more piece of evidence that they are talking nonsense.
