How often do I service?...

[Chadd925]

So the guy that sold me my 2006 4-tec GTI ski had it serviced after the last time that he was on it (summer of last year). I checked fluid levels and they looked great, and he had the spark plugs done already, and put in a new battery. I have ridden it twice now with no problems, it just hit 50 hours ( of which I have put on 6 hours). My question being: how often should I be having the ski looked at and worked on by the dealer? Are there any 50 hour services that should be done?