Posted by Indiana Ken on November 15, 2011 at 17:15:12 from (66.249.234.120):
In Reply to: Theorey? posted by barnE on November 15, 2011 at 06:49:10:
Most likely the saw speeds up because it is set rich, from best power. As it runs out of fuel it passes through the best power setting briefly before running out of fuel. I have two Poulans, one I bought in 2002, and set them for best power then go about 1/8 turn rich. I have never noticed them to speed up before running out of fuel.
I do not set my two strokes rich as they run much better with the proper mixture. That includes my lawnboy mower, leaf blower, weed eater, toro snow blower. For high output racing or modified two strokes running lean can/will result in problems. However, for standard two-strokes I have never experienced problems from "so called lean settings". Setting them rich results in plug fouling and poor running.
Tractors will not exhibit this since the speed is typically controlled by the governor. Cars could if they were running a wide open throttle however, again that is not the normal condition.
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