Not Ranked
It's not the MSD, it's your high idle speed. The higher idle speed means you adjust your carb butterflies open "just enough" to sustain the 900 to 1000 ( or more in some cases) idle rpm. Those carb butterflies are open "just enough" to allow the engine to continue to draw air in through the carb, mixing gasoline with that air, and the fuel/air mixture is then ignited by the hot combustion chamber, instead of the spark plug. Because this is now a "random firing event" based on the heat of compression and the hot combustion chamber the firing is not "timed". Thus the motor runs terrible, it runs, but not well. It may even at some point briefly run BACKWARD. Which is just hell on the timing chain and other internal components, very nasty this dieseling effect.
Kill it with the clutch at the same moment you turn off the key. Or reduce the idle speed by closing the carb butterflies "just enough" to prevent run on.
Now if it is running really smooth, as if you never turned off the key at all but you really did, THEN you might need to address the MSD thing.
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