IISmok3II

HI GUYS , this is my first forum post so any help will be much appreciated . here it goes , iv got a yamaha yq 50 aerox , and im having trouble with it and iv about just run out of ideas with it . the problem is it is hard to start when it is hot or cold sometimes requires starting fluid . when it's running it ticks over fine but soon as i pull the throttle back weather its on its stand or im on it it bogs down and stalls (cuts out ) . i have stripped and cleaned the carburettor and cleaned the air filter and changed the plug and still nothing . any help will be much appreciated thanks regards steve .