Running issue scooter left for 2 1/2 years

Hi all, i'm after some help.
I have a Yamaha Cygnus which I haven't use for over 2 years. I ve started to try get it back on the road, brought a new battery as old one was dead and wouldn't hold a charge.
I manged to get the bike to fire up using kick-start and also on the button. The issue is that it runs for about 10-20 seconds the dies. The only way to keep it going is to give a little throttle but as soon as i let go the engine dies.

Any Ideas appreciated

 

Is it the carb model? If so carb will need a clean and fresh fuel running through the system. Old fuel will be rubbish by now.
Also worth changing the plug if you havent already and giving it a oil change as after two years, The oil wont perform as it should anymore.

 

Hi, not sure its 2004 model. I have put new fuel in tho. Clean carb is it a big job?

 

Just looked a the manual and yes it has a carb.

 

Its fairly simple. Plenty of videos and tutorials online on how to do it.
First time doing a carb clean is always nerve racking but take it slow, lay out the pieces neatly on a piece of kitchen roll and dont mess with the idle/mixture screws on your first go.