To the FI vs. carb point:
From Yamaha's press release regarding their new fuel injection -
"
Yamaha Golf-Car Company is pleased to announce the introduction of Electronic Fuel Injection as a standard feature for all Yamaha golf car based Personal Transportation Vehicles."
The entire press release - click on the 2nd one down the page:
Yamaha Golf-Car Company | Press Releases
Perhaps they're still offering a carb on other versions of their vehicles. Or maybe it can be had as an option on the golf carts???
Bill