Originally Posted by crassius
I've always found that the engine begins to run leaner as the rings seat. Most like to be set leaner at first, but can be richened a bit later. Whenever I deliver a new engine without running it in well myself, I always send it out a bit on the rich side to allow for this.
That is interesting stuff - I think you've got me headed in the proper direction, here. The happy part of all this is, that with the improvements I've done to this little sucker the experimenting is actually fun in the good spring weather.