Carberettor help ?

[sunonmyface]

Hey guys , i recently purchased a Yamaha TW 125 only to find there was a slight problem. Whenever i put the choke in, the bike would cut out, so i took it down to a local mechanic, he had a gander and said i'm missing a mixture screw from the carberettor. Unfortunately i have no idea what this is so i looked online to find a spare and found a diagram sheet for the carb where you can purchase spares, i have have no idea which one the mixture screw is so if anyone could point me in the right direction it would be much appreciated , cheers

Carb diagram sheet.

http://www.yamahascooterspares.co.uk/spares/epc2.asp?PageiD=8&modelID=9794

[YPVS TONE]

I would say item 16 on diagram

[drewpy]

I agree and don't forget the O ring and washer too

[sunonmyface]

cheers guys , much appreciated !