1) Front and rear diffs
2) crank oil
3) air filter
4) brake lines

Also how often should I bleed the brakes and change the fluid?

 

1ST OFF I DONT THINK YOU will have to bleed the brakes unless you have to put on new lines front and rear diffs if you ride in wattery muddy conditions i would say just once a year but you should check em every now and then to make sure there not milky air filter and oil i dont think really has no time span i just check my oil after every 4 rides and change it when its starts to get dirty you can look at it and tell and for the air filter if its not real dusty were you ride then i would say every 6 months but once again if you ride in alot of mud i would check it atleast everyother ride to make sure its not wet or muds not on it and i think most of the time brake lines are going to outlast the atv so no worry's there.[img]i/expressions/face-icon-small-happy.gif[/img]