Airequipt Festival 250 slide return slow, seems gummed up. What is best way to clean or repair?

it most likley needs cleaning they become gummed up after a while espcially if it has been sprayed with WD40

if its a cable choke, just replace the cable and you will be ok, If the choke slides on the carbs are really gummed up, you Will have too remove your carbs and clean them individually, You will need a factory manual for this procedure.

There is a better than not posibility that your carb is gummed up from sitting for a long period of time. The BEST way to overcome this problem is return to the dealer and ask them to clean and adjust your carb. You can do it ... if you have proper tool and cleaners. It will not hurt at all to have your 14 year old Kawasaki properly attended to as a new owner. After you get this this repaired, I recommend you use a guel conditioner which will lessen the occurrence of gum build up on your machine due to inactivity.

If the slide tray doesn't advance or reverse using the on-board or remote control buttons, chances are that: 1. You have a broken mechanism drive belt. 2. You have a jammed slide change mechanism module or 3. The mechanism trip contact is trapped behind its mating contact on the mechanism camshaft.
All of these problems require service documentation & special tools. My recommendation is to find an Authorized Repair Dealer.

the fan motor bearings are dried or gummed up and need cleaning and relubrication. not a good ides to run without the blower. the heat can damage slides and blow the lamp.

remover all plastic/ rubber parts
then soak the whole carb body and slow jet in lacquer thinner

the slow speed jet/needle circuit needs to be cleaned with just 1 strand from 18 gauge copper wire going through all passages an holes pilot circuit in pic

try sprayin some wd40 around the bore in carb some times it gets a bit of dust in and that tends to make the slide stick and be sure t sprar out the port were the float needle goes and if that dont work take it out again and check the float pin it could have been bent at some stage ok mate

you don't give much information on how the bike is running.  But most times when there is a performance decease it is best to clean the fuel system.  Spray some Gum Out or similar product( I prefer Deep Creep and Sea Foam) in the carb. then follow up with some in the tank.  Also change the fuel filter.