Hi there Guys ,
please help ... I have tried researching this issue and cannot find an answer....

We own a KX250 that has recently been overhauled .... long story short a friend of ours sent the bike in to have it resprayed etc .... complete stuff up .... the bike came back to us in pieces .... we have put the bike back together , but now the issues start ...
When the bike starts , it idles nicely for about 10-20 seconds then all of a sudden revs out of control and there is no way for us to stop it .... we have tried adjusting the air screws and idle screws but no no avail the bike just revs our of control ... is there somebody that has any sort of advice as to what could be causing this ? please please i am at my whits end with this bike .......