A bit of a mystery this one. Looks to be a Yamaha dohc twin from the 1980s. The small drum front brake says it is a small motor - maybe a 250. Mhouais... Ressemble étrangement à une Suzuki GR 650. Bien plus qu'à autre chose??? The motor does look like the Suzuki 650 but those all had disc front brakes.
That motor is a dead ringer for a Suzuki GS450/450T Link to "2.bp.blogspot.com" not a GR650 Link to "www.riderforums.com" As is the paintwork Link to "s1109.photobucket.com" I just can't find one with a drum front brake