Picture didn't come through because I didn't post one. :lol:
What I meant by "this" is what you said about the crank pully/harmonic balancer. The rubber deteriorates and allows movement and will "knock".
I can't recall if the tonewheel for the crank sensor is mounted to the inner or the outer part of the balancer, if on the outer, movement could affect engine timing and performance.
Not gonna come right out and say this is definately your problem but it is a very good possibility.
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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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