When I converted my single-ring Ryobi 31cc recently I put on a larger carb and a Frank Bowman ring. I have just ordered what is supposed to be a twin-ring version to convert and have a question about the rings: Will it help to also get a ring(s) from Frank for this engine, and if so, should I replace both or just the top ring? My guess would be both, but I'm more of a plane guy than an engine guy, so what do you think? None, one or both? Thanks for listening. Dennis