Was looking at going with a bigger displacement in my '01 426.. (quad chassis) I have heard of issues with pistons cracking in the 440 & 444's. Anyone have any experience with this? Was also looking into possibly using a YZ450 cylinder if it will bolt on, or maybe stroking it. (if a YZ450 crank would fit??).. or maybe even a YFZ450 ATV crank/cylinder..if that would also fit.. I was checking out the ice cube cylinders, and see they don't make one of their own for the 426, but they have some nasty kits for the 450's..