RE: Adjusting the low speed?
Great explanation! Thanks and saludos desde Japon! By the way, I did first set the high end (and was getting around 8800 which is fine with this engine) but it started running unreliably at about 3800. So I started making adjustments to the low setting screw in steps as you suggest. I didn't however readjust the high end each time. But when I did get a good idle I adjusted the high end but couldn't get anything above 8500 and even at that the engine was running too lean.
Anyway, I'll try following your method next time out.