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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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