I have a uesd Supertiger .75 I got on a airplane I bought a couple of years ago. The engine ran fair...but was really nasty looking. I took it apart to clean...and broke my first piston ring removing it. Kinda ticked me off. well it looks like I need to get in touch with Frank Bowman to get a new ring. I am going to try the crock pot method to clean it up. Capt,n