Large 4 cyl tractor engines more than 150ci and long stroke are not balanced for a lot of RPM , I know some 4 cyl perkins engines had a balancing shaft engineered in the block to smooth out the engine over 2000rpm. A couple hundred rpm more should not hurt, but if the engine runs rough then it is too much. The cam and carburator also a limiting factor.
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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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