my blaster runs really rough when its cold and dies when it gets warmed up.I jetted it from a 260 to a 280 becuase ill be riding in -5 to -10 degrees celcius.I thought maybe the jets were clogged but i cleaned both of them out and it doesnt make a difference.bore is stock size,fmf exhaust,K&N air filter and boyesen reeds.Will jetting it bigger make a difference? maybe a #300 or so?.