I have the Steel City sister to this saw (pre-granite) as is the Rigid and several other brands, all of which were manufactured by Orian in Taiwan IIRC. Although the saw is 1-3/4 HP, I have never really found it to be lacking in power. Although I do normally use thin-kerf blade’s a also tend to use high-tooth count blades (60-84), which more, or less, nulls out the advantage otherwise provided by going thin kerf (that is, versus a lower tooth count 1/8” kerf blade).
If your saw uses the same motor as mine, and it almost certainly does, the motor can be wired for either 120 or 240VAC. Do note, however, that there is no horsepower gain afforded one by converting to 240VAC as it will still be a 1-3/4 HP motor either way. However, if you have 240V service in your shop and you use an extension cord to reach an outlet then it is advantageous to rewire the motor for 240VAC as it will be less affected by voltage drop which means a bit more power actually reaching the motor (and that is the only fractional advantage in power you will see from 240V versus 120V).
But use the saw for awhile before you consider upgrading the motor to anything larger as I think you will find it to be more than adequate for most everything one might want to do and what little you may notice it being under powered for can always be tackled slightly differently to achieve the same end. If you did install a larger motor I would probably go no more than perhaps 2HP unless you have verified that the trunion assembly is more than adequate to handle the added forces incurred by a larger (and heavier) motor — also keeping in mind that it uses only a single belt and pulley to transfer power to the arbor, which may, or may not, be adequate to handle a more powerful motor.