Tony Iannucelli, I have nothing against Tower Hobbies. I order from them quite often, but $27.00 for a ring for your OS .61SF is ridiculous. Frank Bowman produces and sells rings for any engine you can come up with and his price for up to a .65 size engine is (was) $11.50 shipped. And I would trust his rings before I would the rings that Tower is selling. You can email him at [email protected]. He will get back to you within hours.

And the rich/lean/rich/lean thing is for ringed engines only, as I understand it. I don't believe you want to do that with a tapered bore ABN/ABL/ABC engine. At any rate, follow the break in instructions supplied by the factory and if you have a new engine without instructions, ask here and someone will gladly send you a copy of the factory manual.

These are my opinions. I could be wrong. I'm sure someone will advise me if I am [8D].