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It's easy. All "hit and miss" refers to is the unique operation of an engine to only fire the spark plug when it needs to in order to maintain a certain speed. This is accomplished through a governor. The most common method (used by maytags) is that then the flywheel spins fast enough, a spring loaded governor attached to the flywheel tries to fly away from the center and causes a set of electrical points to open, thereby preventing current flow to the spark plug. When the plug fires, it causes the engine to speed up and go faster than the minimum speed. Once it slows down to this minimum required speed or slower, the governor allows the points to close and allows the plug to spark for as many cycles as needed to get back to that pre-determined speed. So, what basically happens, is that you get a John deere sounding *pop, chuff chuff chuff chuff chuff chuff, Pop! chuff, chuff..." under no load. When a load is applied, the plug fires more often and you get a *pop, pop, chuff, pop, chuff chuff, pop, pop, pop, chuff, pop* sound. The later mayag twins were throttle governed, which I don't quite understand but i think it's kinda like setting the carb at a certain setting on an engine and just leaving it there. All you get with them is a continuous "whirr" like a smoothly running car engine. Not quite as neat and exciting, but a lot smoother and quieter. Anyway, that's a simple explanation of Hit and miss.
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