I have an 01 polaris 600 XCSP I got this sled cheep and the motor was rebuilt but they put the pistons in backwards and then took it appart and put them in the right way but I think they might have wrecked the rings so when i got it I did a compression test and both were low 90's psi. so i dissassembled the top end and one piston is slightly scored but the jugs look ok but are very smooth should I hone these befor installing new pistons and rings? i will be checking with dealer but for now any help would be appricated thanks R......