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The way to think about voltage and amperage, is the same way you think about water flow. Imagine I have a 12 foot water fall (analogous to a 12 volt differential between + and - poles on a battery). I could have a 12 foot fall on a small creek, or I could have a 12 foot fall on the mississippi river. On a creek, a 12 foot waterfall might provide enough power to turn a small paddle wheel and run a small grain mill. On the Mississippi, a 12 foot waterfall could provide enough torque to run a gaggle of turbines and light the city of St. Louis. A battery works the same way. All standard motorcycles sold in america (at least the ones I know about) run on 12 volt systems, as do cars (meaning there is a voltage potential of 12 Volts between + and - poles of the battery - analogous to the height of a waterfall). The bigger the engine, the more power it takes to to turn the starter and crankshaft. Amp-hours is a measure of the power output of a battery (similar to the amount of water going over the 12 foot fall per unit time). The stock CB750 uses a 12 Volt, 14 Amp-hour battery. If the engine had more mass, or more pistons producing greater displacement and total compression, then you might need a battery with greater cranking power (more amp-hours). But, for stock CB750, a 14AH battery will work just fine.
Bubba.