I decided to change, improve and lighter the 650 a bit.
Mounted some donated plastic fenders from a honda crf. Replaced some brackets and bottomplate by alloy ones. Had to fix a rearshock. The seat is twice as thick. Replaced the powerbox and mounted an other gastank from a Motobecane. Still need to make some new footpegs because the Original keeps bending and breaking of and maybe try the Mikuni carb again :)