I have the shop manual for a 2017 Yamaha golf cart (400+ pages) I did not see anything regarding adjustments for the gas pedal.
I would suggest you try a friend's similar golf cart to see if the pedal feels the same. If yours is a lot stiffer, there may be a problem with the cable to the governor. You could try lubricating the cable. As for the spring, you could take this off, and see if the pedal moves easily, if not look into some lubrication of pivot points. If the spring is still too tight, you could see if there is a similar spring at some of the hardware stores that you could adapt for your use. I do not have any other ideas.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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