Don't get too hung up on carb icing incidents on the Vigi. Yes they still occur but no more (possibly less) often than in the GA world and as a rule they are handled more safely than the GA incidents.
The majority of the Vigi's engine troubles were not carb icing, rather they were ignition related with the mag doing odd things and the plugs growing wiskers, both issues now many years in the past.
BTW the later problem was solved by the Syerston techies trying different oils until the solution was reached by using oil with a picture of a Tractor on the label
