I have an old OS .48 4-stroke that is old and tired, it is slowly loosing compression. It is a good engine and I would like to recondition it. Unfortunatly that size hasent been made for a while. Can I boor out the cylinder and use .52 cylinder liner and piston or is .48 parts still available? What are my options? Please help? I bought a specific plane just for this engine and I still want to fly it. Its a .30 size Extra 300 from Yellow Aircraft.