i have a 89 blaster 240 with fmf fatty pipe and dg silencer and its got the 240 kit i believe the guy at the shop told me it has the right jets now it was running fine the other night (saturday) and then sunday when i went to go riding it wouldnt ride right and now it will backfire unless i have the air/fuel scarew all the way in and it wont idle now could this have something to do with the throttle cable because i turned it in and it stopped idling after that because it was reving way too high.

if you think i should change the jets what size should i changed them too??