May not matter if its not used for heavy work. But as Pete said IH recommended a 17 degree impulse coupling rotating unit complete be installed in the magneto for FC pistons in a M. On a 400 and 450 IH recomended only using fire crater with a distributor. Also not to have total timing over 25 degrees at the crankshaft. They had a template in some sets to mark the crankshaft pulley if it didn't have the mark. Not sure if IH recommendations can be compared with now. But in the sixties when a lot of fire crater kits were being put in I think the gas octane was as good as todays. At least what Dad used on the farm, we used it in 10.5 to 1 compression engines with no problem.
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Today's Featured Article - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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