Old Enduro Race

This is an "old" video from the eighties-nineties , taken from Super Channel, who shows "The IMC Tour of Mann", an off-road tour which was also ridden by Famous motorcyclists suchs as Carl George Fogarty, Allan David Jefferies, Mick Grant, Robert Steven 'Hizzy' Hislop, John Reynolds, Terrence 'Terry' William Rymer.
The bikes, that the Lord of Motorcycling I mentioned above drove in that race, where big enduro ones, like the single cylinder 644cc Honda Dominator or the twin cilinder 750cc Yamaha Super Téneré, all in legal-version since you can see the number plate, street-legal tires and big indicators.
Note that they drive almost sit on the saddle, and not standing on the footpeg.

"The great old enduro race ....Honda NX650 Dominator,Yamaha xtz750 Supertenere,Suzuki Dr 750Big,Kawasaki klr650."

I am not sure but I suppose it was a race to promote the street bikes on sale at that time from the manufacturer that partecipated to the Grand Prix of the Isle of Man (Manx GP) in that year.