G'day Norm

I don't think fuel mix ratio was the problem.
The issue appears to have been flooding of the engine - of any mix -
for starting. But there were other issues too!

I feel this is a classic example of Victa under-testing new products,
like the Predicta on the Victa Automatic.

They must have been under pressure after the Sarich engine fiasco ...

Here are some Service Bulletins on the Twin supplied by by the Great Mr Davis that may help:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/38878/some-victa-twin-info.html

Cheers
Jack

p.s. I love your new avatar ...
simple but powerful laugh