First, welcome to OCC......... 
You say you have a 2006 RZT50. There is a Factory Code on the model/serial tag that helps fine tune the identity. In my research, that the RZT50 has two choices of engines, being Briggs and Stratton or Kawasaki.
Will have to have more information to further assist you.
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[B]Roland Bedell[/B]
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
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