In Australia, the regulations regarding motorcycle engine capacity are primarily based on power-to-weight ratio rather than specific engine displacements like "70 cc." The power-to-weight ratio determines the license class required to operate a particular motorcycle.
This rule is often referred to as the LAMS (Learner Approved Motorcycle Scheme) or RE (Restricted) license category.
Additionally, it's worth mentioning that some smaller capacity motorcycles, including those with a 70 cc engine, may not be commonly available in Australia, as the market tends to focus on larger-displacement motorcycles. It's advisable to check with motorcycle dealerships or manufacturers to determine the availability of specific models with a 70 cc engine in the Australian market.