Yes,there was a a number of faults with this Tina
scooter,mostly due to a lack of development,on the
first models you could rev it up and away it would go,
whether you were on it or not !!The later models had a switch on the centrifugal clutch which was connected
to a pressure switch which operated when you sat on
the seat,this prevented the unexpected take off !!The
centrifugal clutch on the early models did give a lot of
trouble with excessive wear and sticking either fully
on or fully off !
There were much worse models than these.