You are probably pretty close with an air/fuel ratio of 12.8:1 for under load. Automotive engines richen the mixture under load , O2 sensors will read about .8V , with .5 being equal to the optimum 14.7:1 which is what they aim for at cruise and idle. You need the extra fuel for a safety margin to keep combustion chamber temp down under load, if it gets too lean under load, you melt pistons. I have been watching your progress on this for awhile , you have way more patience than I do. A dyno would make your life easier. I work in a Ford dealership and curse the new technology some days , and enjoy my old tractors for their technological simplicity. You seem to be doing just the opposite. Good luck on your project.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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