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Crueby---the exhaust valve was "disabled" and held open. That way the crankshaft could revolve as many times as it wanted and not come up on compression. And since the valve was held open during the miss cycles, there was no vacuum created to draw fuel into the carburetor.---So--during all of the "miss" cycles when that engine was coasting, it didn't use any fuel either.
If we allocate the symbol w to the rate of spin in radians per second, then the angular momentum equals I x w^2 or w squared. The two equations together mean that angular momentum is proportional to w^4, so very sensitive to the distance of those balls from the axis.