Once a Thief

Une belle Honda CBR 600, environ 1992 sans certitude, cause coloris américains

That is a 1994 Honda CBR 600 F2

Kawasaki Police 1000, which mysteriously transforms into a dirt bike when it performs the jump

I like the comments made by badlymad relating to the bike that `transforms into a dirt bike when it performs the jump'. Having a Kawasaki Z1000P myself, and knowing how heavy my bike is, l am not surprised the jump was made using a lighter bike. Watching old episodes of the `Chips' series, there were many occasions when the Z1000P in a particluar scene was changed from that previously seen in the episode concerned, i.e.black and white tank, to all white tank, red pursuit lights to clear ones etc.

They are all Harleys and mostly mild customs. Difficult to identify positively.