I have a 2012.5 EFI Yamaha cart (that is when the fuel injection was first offered). It can be governor adjusted. I've had mine up to 24, but currently have it set by the store as bought at 21. I think the noise is not objectionable, though it is louder than an electric in the tunnels.
My cart has had some early-on problems covered under warranty. Most problems were fuel injected related and seem to have been fixed.
I have 10" tires and don't know how smaller diameters would work.
It does maintain speed going up hills, no problem.
Hope this helps.
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Columbus, IN and Aberdeen Proving Grounds, MD
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