Cylinder cut out question

[MechanicMike]

I've been reading alot of old posts about how some of the OX66 models feature a cylinder cut out that drops 2 cylinders at low RPM's for I'm guessing emissions reasons?? I read an old post stating this feature is not available on the non v-max 150. I own a 2000 model SX150TXRY, just curious if someone can clarify this for me?
I read that if the engine has the feature and all cylinders are firing at idle, there is a problem. I'd like to know for diagnostic purposes.

Thanks, Mike