**** 原付：げんつき；GEN－TSUKI; bicycle with motor ****
It means just small bike with 50 cc engine or 650 W electric motor.
It's restricted in max speed at 30 km/h by law but actually you can ride on it at 60 km/h on flat road.
As one can get the licence automatically when one get driving licence, most of all Japanese can ride on it legally.
However, the makers like as HONDA, YAMAHA an SUZUKI are going to stop making these small bikes because these bikes have not international market. the makers want to move larger class bike.
Also, law is said to be change. when one got driving licence, one can ride on bikes of 125 cc. I'm afraid it is too dangerous for beginners to ride on 125 cc bike.