Hi Jonesy, from my research, I have found that the Model 2a Rotomo was the 6th Victa produced, it was the first to use the plastic wheels, had the a 125cc engine.... was produced in 1957-58 and had the Model 3F carby as did the Model 1, 2 and 3 Roto's. It also had the first Victa magneto.
It must have had only a short run, as the Model 3 started production in 1957 also, and it itself was a 'transitional' model.
