[b]Demi:

Before you reassemble the engine wrap a bit of 600 grit around your right index finger, then stick it through the sleeve with plenty of light oil. Use the palm of your left hand to roll the sleeve on your finger, moving your finger in and out as you roll the sleeve. This in and out is to keep from making any purely circular cuts in the inner surface of the bore.

It doesn't take a lot, you may not see any difference in the appearance of the bore. If you see even a slight changer you have definitely done enough.

Wash the sleeve in hot soapy water, rinse thoroughly, dry and oil it.

I strongly recommend a fuel with at least 3% castor oil. Makes the ring (and the rest of the engine) last a lot longer. And gives a lot better protection to the bearings, Use a good after run oil as well.

When you restart the engine let it warm for 30-40 seconds, go to full throttle and immediately peak the mixture, then back to idle for 10-20 seconds. Full throttle again, then back to idle again.

Keep repeating this for about 90 seconds total, and the ring will be seated.

What you are doing is using the maximum combustiion pressure to force the ring against the wall at full throttle, then allowing it to rest and reoil with the idle time. Contrary to popular opinion, the ring will seat in less than 90 seconds of running time.

Note: While the ring will be seated it will not be totally "Broken In" yet. This is a matter of the ring gap. At the higher temperature of full throtle running the ring will expand, if the gap is too narrow the expansion of the ring will cause the gap to close, and the ring will bind.

After your initial run to seat the ring, restart and run the engine at full throttle for 30-45 seconds. If the rpm doesn't sag go back to idle for a moment, then go to full throttle for a little longer. When it will hold full throttle indefinitely the engine is once again ready for unlimited flight.

If at any time the engine rpm does fall off at full throttle bring it back to 4-5K rpm, richen the mixture a little bit, and give it 5 minutes or so, then recheck at peak rpm. Shouldn't take a lot.

Hope this helps.

Bill.