Yeah, pretty much everything that Bob said. You don't see the ring because it's not where you think it is. A Dykes ring is right at the top of the piston and if the engines are new, it blends in. Break in is just a matter of putting enough fuel through it at an easy needle setting and minimal load until the exhaust comes out clean. Use all castor fuel or at least 1/2 castor and 25 to 29% total oil. Use a wood prop, 10-4 cut down to 9 inches or so. Run ir in a high four stroke setting, pinch the fuel line every now and then to clear it's throat. The exhaust will be black at first with metal, and will clear up quite a bit as the ring seats. It won't get crystal clear but I think you know what I mean and will see the difference from beginning to end. I've seen it in as few as 6 or 8 runs but may take more.
Good luck and have fun,
Dan McEntee
Topic: Testors McCoy Series 21 engine type? (Read 1809 times)