Gilera 125.

Styled like a sports bike but all the mechanics are scooter derived in the back end. four stroke water cooled about 12HP.
The petrol tank Is false and lifts up for helmet storage etc.
Quite fun to ride. But I never did in shorts

The main problem we had was that the only tyres avalible where super soft and you only got about 2500 miles out of a back one at £45 a go.