I finished rebuilding my 090AV-new seals, bearings, PC etc. It has a 7 pin rim sprocket running 9/16 chain. Idle is set to 1657-used a photo tachometer, max is 7300 when governor kicks in. I have 2 questions-is running 9/16 chain at that speed a bad idea or not? It cuts 6-18" logs well but...