OP, you might want to check the main drive belt, we have a 2017 Yamaha quietech and it was set for 19.5 to 20 mph, then the secondary clutch failed and while in the shop for repairs the tech noted we had the wrong belt, changed the belt and now the cart goes up to 23 mph...
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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