660 grizzly rebuild kit
 

I'm looking at rebuilding my 2003 660 grizzly.i found a ebay kit that comes with a 686 cylinder and high compression piston 11:1. And a mudbuster cam. Comes with all gaskets and new timing chain. Just wondering if anyone else has tried this setup before and what the gains were. I want more power but dont want to lose reliability.
thanks for any opinions