ORIGINAL: CGRetired

I've used the following on OS 46's (three of them), OS 50, OS 60, Super Tigre 75, Evo 100, and Evo 40. All the same as far I can tell and all run just fine.

Fuel up, start the engine, let it warm up about 30 seconds, go to full throttle, rich it till it starts to 'four stroke', smokes like hell, run for 60 minutes at full, close the needle to run leaner for about 10 seconds, go back to rich and shut it down. Wait about 5 minutes and recycle as above. Do this for two or three tanks and go to the field and forget about it. If you baby it, it will run lousy. Break it in as you would fly it, but do it a tad rich.

DS.