Levo-Lon
Guru
Regardless of what your licence says it has obviously been so long since you have been near a motorbike. It is worth going through the whole process again. A piece of paper doesnt mean you can ride a bike. Only good instruction and experience will. It is worth it.
You may have the idea of "ONLY" riding a 125cc bike. I have had everything from an 1100cc Moto Guzzi. But I broke both arms and right leg on a Honda C50.
Ive had more injuries doing mtb than 30 yrs on motorcycles.. Bloody dangerous these mountain bikes