okay so i bought a banshee awhile back and after a few months of riding i got a rod/ball weld to have fun with. well while tearing down the motor i found the previous owner decided to use a broken piston in the right cyl. (ill post pics and since Ive never bought a new piston i need some help figuring out what size i need. another factor to this equation is the last owner gave me an extra set of jugs that are larger and are ported, i dont know if its a good job so ill post pics of that as well for opinions. the only problem with the second set i can see is some a layer of rust can it be removed safely?