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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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