You can just by a new immobilizer unit (antenna) and then code re-registering and register standard keys. the code registery is not a difficult thing just put the old code key in and turn it around and the immobilizer light will come on for one second and then its done. To register the standard keys there is another procedure.

5YK-8255P-00 is the partnumber for the immobilizer unit XT660Z 2008-2015
it is not cheap but you need a brand new unit

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XTX 2011. Yamaha Hand Guards, Akrapovic slipon mufflers, Snorkel removed, Airbox drilled, AIS Blocked, PCV, Dynojet Autotune, Kev O2 Controller, Dna Stage 2, KN air filter, mini indicators, steel sprocket cover, cnc levers, cnc mirrors.