NJ LSV's require the following (among other stuff) that your Yamaha might not have now
Speedometer
Odometer
4-wheels brakes
Seatbelts
Headlights
Tail lights/brake lights
Directionals
Rear view and side view mirrors
DOT front windshield
DOT tires
Here in New Jersey you will not be able to register your cart as a LSV without a 17 digit VIN that decodes as a LSV.
Getting a VIN in NJ will be nearly impossible.
There are a few outfits that modify carts to LSV specs and claim to be certified to issue 17 VIN numbers. Here is one:
https://www.midsouthlsv.com
Based on the above I bought a factory LSV (E-Z-Go 2Five)...it's been checked over by the PD a few times already.