I have a blown piston on a 19991 polaris indy 650. I do mechanic work but never on snowmobiles. I need some help with the process. I know it needs to be bored but what are the specifications. I was looking for piston they got all kinds .060 .020 .040 .100 how many more cc's do I get. Any help would be appreciated

Just bore it to the next size up piston.