Also, when you are all set and up and running again, use a fuel stabilizer if it won't get used much in the season.
If you are in a climate where it does not get used year-round, drain the gas from the tank and run the machine until it turns off before you put it away for the snow season.
I just installed a set on my RZ46215 and they look pretty killer.
www.mowersdirect.com
The picture listed above with the circled portion is what I should have and is what is listed in the parts manual. I have attached a picture of my machine that does not have this feature.