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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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