Nothing, other than general service items, and a couple of sets of tyres as I got better at riding it!
Competent in all weather conditions, it will eat up miles better than you would expect, and is happy being ridden sedately or hard, depending on your mood.
I bought this as my first big bike (well actually my first proper bike following the R125 I did a few miles on after passing my CBT, which I out grew after 2000 miles (6 weeks) on it).
A very forgiving bike, comfortable and easy to ride. You can learn/develop your riding on one of these quite easily if you respect it for what it is and take your time as I did. Don't waste your money on a 600 - skip it and buy one of these!
Within 1500 miles, and with some help, hints and constructive criticism from friends/fellow riders, I was getting a huge amount of enjoyment from this bike and can now do pretty much everything I want to on it. Riding smoothly is the key.
In standard form, these are proper quick, and they stop just as well, but you will quickly start working out what you don't like about it and will be looking around for advice and upgrades to suit your riding preferences. Don't worry, there's everything you could every want, and it won't hoover out your wallet either.
I've got to a point now where I have introduced some upgrades... dynojet (the best £100 you will ever spend on a bike) to iron out the flat spots, K&N, headers, exhaust system, removal of the EXUP valve, sports plugs, -1 sprocket kit (you thought it was fast before - try and hang on now!), EK530 chain, uprated brake lines, quick shift and a dyno setup.
Anyway, enjoy whatever you have, but if you want everything and more from a sports bike for not a lot of money, then get one of these!!