Hope that wasn't an oem 220 piston......
What is it you're after? EG does indeed have a big bore 'kit' for the 200. Makes it 225. Make sure he knows what gas you're going to use. He has to know that to make the required changes to the head.
It is not a sleeve. It's bore/replate. BTW...expect your range (miles/tank) to take a pretty big hit in the process. If >70mile rides are your 'thing'...that won't be happening without carrying extra fuel with you.
You can learn more 'bout it by clicking on his ad to the left, then going to his website. He has a write up on 'big bore' kits there.
Obviously there's more to it than boring a bigger hole and stuffing in a bigger piston.
If you're knowledgable enough to do the required port changes, head machining (combustion pressures will increase to self-destructing levels if you don't) and KIPS re-fit...you're way ahead of most riders. With a dremel tool, even!
***edit**
One of these days I'll pay attention to what YEAR is being discussed.
I apologize for the worthless effluent. :(