Hello Nom, 
I took the small decompressor pipe off the inlet manifold, modified a black plastic flange as shown in pic to pit  the fins. Rivited it  using the hole from the decompressor. 
It ran well, very smooth, mowed half the backyard..... I will put the top stuff on the mower. The primer didn't work well so I started it with my Bosch electric dril adaptor..... easy....
And Mowerfreak, I have two Powertorques. They are my favourite Victa because of the unusual desigh, Aussie genius I hope and the power...
cheers
speedy.