Probably a compression problem with that many hours but there is a ton of wrong information on starting these engines. First off, does it have original style injection pump. That would be a Bosch CR version. The head of pump is circular configuration where injection lines are at. The sweet spot mentioned is where that engine runs the highest rpms with throttle set at lowest speed. This should correspond with the point where the lever on pump just touch's the spring loaded plunger and that is adjustable. Once you get that adjusted properly, to start you leave throttle in lowest speed position, pull cable until lever on pump just contacts that spring loaded plunger. This will give maximum fuel for starting. As soon as it start, just push in cable and adjust speed with throttle. If you put throttle just part way for more speed when pulling cable it will actually reduce fuel and start harder. If you have the CR, later version pump, then you advance the throttle part way when starting. The service manual gives complete instructions on which procedure is used with which pump. Also, IH released a higher compression piston for those engines and that starts much better. Very hard to determine what pistons you have or what your valve recession in head is (which has a lot to do with hard starting also) with a compression test as there are just too many variables.
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