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This is some great reading. The one thing I see that is not considered enough is balance. These engines (Military) are assembled from premanufactured parts. They (the parts) are manufactured to a specific standard, and it is assumed that they will be OK when put to work. Once the engine is...

I'll bet if you checked the tach with a known rev indicator you'll find it's wrong. The spring looses it's strength over the years.