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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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