Power to weight ratio is a much better plan for deciding what bikes are learner "safe". The current cc rating law means that you end up with manufacturers squeezing every last drop from an engine making them peaky, which usually translates to more difficult to ride than something that makes smooth progressive power from nowhere.
A 650cc bike making 40HP usually makes 100 - 150% of the peak torque of a 250cc bike making 40HP, meaning that the generally larger populace, much larger than when the law was introduced, can buy a bike that doesn't feel like an aneamic weed whacker to ride. When I were a lad, two strokes ruled because they not only felt quick to ride, they WERE quick within the parameters of the day.
It certainly opens up the learner market and would finally get rid of the almost despotic hold 10-15 year old bikes have on the "performance" learner market. Sid and Mabel would be able to buy new, matching 883 Sportsters when the kids move out of home (finally).
Not all states in Aus subscribe to the KW/KG rule either. I think it's only NSW and Queensland.
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