cunka72

Has anyone seen a piston like this, i recently take out a piston for changing piston rings and i saw this hole one the side to exhaust. Should i purchase new piston or just new piston rings? WHere do i measure piston or cylinder bore to find out what is my piston size? Should i bore cylinder for bigger piston? Thank you very much Greeting from Croatia http://imageshack.com/i/m914b9j http://imageshack.com/i/2hejzkj http://imageshack.com/i/ngk2j1j