Mostly, the Emissions are what is dictating the Design.. The Government requires a certain level Maximum Emission and the Manufacturer must comply.. The higher the RPM, the Smaller the engine Cu. In> required to make "X" amount of power..so they feel it uses less fuel and satisfies the EPA.. Higher RPM's arguably improve "Thermal- Efficiency"... With the latest CNC Machining techniques maybe the new engines will last longer..
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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