1983 gsx250 still carb issue

hi all

We put the air box back in replaced the carb boots checked all the carb springs needles etc and the bike keeps reving extremely high we are not sure what else to do
I need to order another set of main and idle jets does any one know where is the cheapest place their are some carb repair kits on evay for around $40

 

Thanks the throttle cable is clear and been lubed and we put gasket paste on the manifold before the boots

 

Thanks we checked that already this one has us stumped at the moment it has been doing it for a while