Fixed my problem
I had a similar problem to what was described here. My cart seemed to sputter more when having 2 riders and going up a hill. checked for the spark arrestor, and it had already been removed. my cart is a yamaha model YDRA. I found out that a new drive belt is 35mm wide, and ithe belt is supposed to be changed when the width decreases/wears down to 27mm. I measured mine and it was at like 26mm. Turns out the belts wear from side otot side. This is because of how the "transmission" works. I'll spare you the details.
I ordered a new belt on amazon for $20, it arrived in 24 hrs and i replaced it in 10 mins after it arrived. no tools required for this replacement. took it for a test drive w/ 2 passengers and up a few hills and had no issues. I think this solved my problem.
Sounds like you have a newer model, so I don't know the spec for you, but you may want to consult the manual for the spec and measure the drive belt, to see if it is in spec.
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