yamaha xt125x

hi people, before we start here i just wanna let people know im not very good with bikes,

right i brought a 2nd hand yamaha xt125x in bits and ive put it back togeather so far and ive come to starting it up

i can start it up, but with a lot of revs and choke, but wont idle but when i drop the revs to 1500-1800 it revs up n down on it own an then cuts out

as i say i ve had to build the bike back up so not sure if all the cable shuch as throttle choke etc r going through the frame the right way etc so if anyone has any pictures to put up for me or email to me where all the cables should go etc i will be greatful

oh ive try adjusting the trottle cable for idle n choke then ive tryed the idle screw an air/flow mix screw still no magic for me please help

email adress for picture [email protected]