I want to "break-in" my new OS 61 FX Glo Engine according to the manufacturer's instructions. But the whole procedure is based on switching back and forth between "slow four cycle" operation and higher speed "two cycle" operation. I don't know how to recognize "four cycle" operation.

I'm very much a beginner, having run only a Magnum XLS 46 for a couple of hours. I've done the high speed needle adjustment many times, tuning for maximum RPM then enrichening it enough to reduce the RPM by 200-300. But I think all of that is at "two cycle" operation.

Any advice for me on how to recognize "4 cycle" operation? I have the engine set up on a test stand (sort of) and am trying to decide what to do next. Out of curiosity, and without touching the needle valves, I hit it with the electric starter and it started right up. AMAZING!! But I only ran it for about 4 seconds, long enough to shut it down. Omega fuel, 10% nitro, 17% oil plus a little added castor oil.

Thanks for any help.

Frank