goose

my mates 04 290 had a similiar problem. it would start fine when it was cold but had none of it once it was warm. if he left it for 20 minutes it would start again. ended up putting a harder plug in and its been spot on ever since. worth a try

rocking it in gear before you start is the trick. done it with all my bikes for years. just habit now. stops the risk of ripping off teeth in the gearbox.