yamidt

hi there ive just brought this yanaha dt 125 1973 bit of a collectors had one when i was 17 many many years ago lol when i brought it started uo fine and still does but after after riding the bike for only 10 miniutes or so the bike just cut out for no reason once cold its starts back up and the ignison light is hit and miss some times can one shed light on whats happening please many thanks steve