As promised here are the results of my tinkering with my Onan generator.
To obtain preliminary carburetor settings I emailed Onan customer service and was referred to one of their techs. The fellow I spoke to recommended that I preliminarily set both idle and main jet adjustment screws to 1-3/4 turns and adjust from there. I followed his directions and wouldn’t you know it, by the time I was done both jets were adjusted very near to the 1 turn setting recommended by romore earlier in this thread (BTW his “1/4 plus a tich” adjustment worked great). My generator now runs fine.
Thanks to everyone who posted.
Steve
PS I found that it’s much easier to keep track of adjustments if I put a dab of White Out on the adjustment screws. I commonly use the fast drying White Out for marking up mechanical parts. It’s handy because it not only dries fast but the little bottle has a built in paint brush.
