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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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