An A1 motorcycle licence restricts riders strictly to smaller motorcycles or scooters with an engine displacement not exceeding 125 cubic centimeters and a maximum power output of 11 kilowatts. Therefore, operating a powerful 600cc motorcycle on a basic A1 licence is entirely illegal, as riders must upgrade through intermediate tiered licensing frameworks to legal categories like A2 or an unrestricted Category A licence before piloting heavy-displacement machines.