On my Kids Sinnis Eagle 125 (2015 in UK)
I got a small Exhaust for him which is fitted well with a few welds as OEM exhaust was falling to bits,
due to being neglected by previous owner
But after switch on with new exhaust
After decelerate it pops and small flames

I Have found the Idle screw but cant see the fuel/mixture screw to adjust

Is this correct to look for or is it something else ?
Have attached pics of what I can see below

IMG_20180128_153715.jpgIMG_20180128_153725.jpgIMG_20180128_153730.jpgIMG_20180128_155048.jpgIMG_20180128_155058.jpg