hobbys,

The instructions with my OS160FX: http://www.osengines.com/manuals/160fx-ring-manual.pdf pages 10-11.

Saito"s latest break-in instructions: http://horizon.hobbyshopnow.com/shar...itosingles.pdf pages 4-8

Super tigre instructions for ringed and ABC are here: http://www.supertigre.com/manuals/sup-manual.pdf pages 19-25

Old green cast iron lapped piston with steel sleeves engines must be run at the four stroke break and then heat cycled. It doesn't hurt to heat cycle (let it cool completely between runs) and I usually do it with all my engines. Old school.

This will get most of us out of the woods.