Well I was looking at this kit for my 2003 450 foreman. The change in perforemance are said to be substantial.

The changes that are made by resleeving the cylinder and replacing the piston are ...

stock displacement = 433 cc
Big Bore = 475 cc

Stock compression ratio = 8.5:1
Big Bore = 10.25:1

I would assume that minor jetting and carb adjustments need to be made.

I love the Chassis of the 450, very rugged, and even though it has enough power I wouldn't mind a little more!

So I was wondering if any of you out there Has done this or has known someone who has and if it is worth it. Or will I just be opening a "Can of Worms" were I will plague myself with repair issues and hassles?

Thanks for any shared experiences