Dommie owner seeks help for niece

[Confucious]

Sorry folks - not your average trailee - but niece has a problem with her scooter. Honda SFX. The start procedure is to hold in brake lever and press start button - should then tick over but doesn't want to know. I have got it going twice using this theory with throttle full open...but it just chugs. Reckon it's carb settings. Has one big on right and a y one on left...any help would be appreciated

[Confucious]

Sorted....

[FatFergie]

Sorted....

what did you do?