only running engine on centre stand,

[hightower]

When I had my Chinese 125 I wouldn't have dared - it would have snapped the side stand I had to put that much energy into kicking it. That was probably in no small part to the cheap Chinese bike though.

EDIT: Also, my Chinese bike wouldn't let you start (even in neutral) with the side stand down - perhaps that is why I got used to kicking it with the stand up too.