The SAI (Secondary Air Injection) actually has nothing to do with the fueling itself. It's a completely seperate system. Fresh air from your airbox is introduced into your exhaust ports to assist in a more complete combustion of unburnt gasses, hence cleaner emissions. An electricaly activated valve on your air box recieves a signal from your ECU during decelleration and opens, allowing fresh air to be scavenged through the distribution tubes, past the reed plates and into the exhaust ports. Yes, it does sound like a lean condition!
Normal default position for the valve on the airbox is closed. If one were to disable the SAI by way of the ECU, or defeat the system by plugging the lines, it will eliminate the pop/gurgle noises.
I think, and some one please correct me if I'm wrong, but the only difference in the CA bikes is the evaporative canister.
FYI: if you disable the SAI, your exhaust tips get dirty.
Hope some of this helps!