The other day I picked up a 2008 rmz 250 at a very good price in my opinion (1750 Aud) it's completely standard and it has supposedly had a rebuild within the last 20 hours, which seems pretty honest considering it starts and runs really well as soon as I got it I did a service and have put about 2 hrs on it with no problems. Has anyone got one of these? Is there any common problems with them? How many hours should I be getting before rebuilding considering I don't race and only ride trails with regular maintenance? What mods should I be looking into for riding woods/trails?