I have a manual for a BFA 4.0 if thats what you have and if you need it. Points on those are a bugger, plus the little plunger thing can get worn out too.
I dont need much power either. Biggest we do is a college dorm type fridge. I have a Champion 4.0 that is a little quieter than the Onan. Starts first pull too, no fuss. I love the Onan, until its cold and I have to fiddle with it. I dont want a diesel.
My deal with the Yamaha was having enough fuel capacity without spending another chunk of money to make it work.