I have a 2014 Yamaha EFI and when we first got the cart i noticed sluggish and delayed acceleration. I asked Todd Casey about it when he was doing the scheduled maintenance and he told me the OEM drive belt on that model was not designed properly, which was causing the problem. He replaced it with an upgraded belt and the cart has accelerated perfect ever since. For the low cost of a belt, replace yours. You will get better performance as well as piece of mind that your belt won't break and strand you.
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