So, tonight I took the head off of a Wisconsin ABN to fix a stuck exhaust valve. While I was cleaning it up, I noticed the piston is chipped. Unless someone tells me otherwise, I think I need a new piston & rings. Problem is the piston is stamped with a "1/2". Any idea what that means & what size piston I need to buy? Am I going standard or .005" over? Can I still buy "1/2" pistons?
Just because nothing is ever simple, I pulled the head off my spare ABN and found it has additional markings. Any idea what they mean?