help pls :)

[Merciful]

I've a OS 50SX engine that has a stucked carburretor
The last time I use it was June 2005.
Now the throttle control is stucked......
I dun see any rust or other peculiarity from the carburretor opening (I have not yet dismantle the carburretor and look inside though......)
Anyone encountered such issues before?
Any quick way to fix it? i.e. pour in some sort of solvent to dissolve any oxide that had accumlated inside???

Thanks Man!

[joe yap]

This is quite common. I use WD40.