hello i am relisting this topic as no one has answered yet as i said before i have a 2002 400 ex after i ride it for 20 minutes or so the clutch begiens to slip i changed the oil and went with honda gn4 i am just wondering if the clutch plates and springs will fix it or if it is somthing else also does anyone know i have put plates and springs in a warrior is it as simple on the ex as it was on the warrior..  

Sorry sometimes they get covered up by other posts and i miss them.

have you tried adjusting the clutch?
there is a rod that runs through the middle of the clutch basket with a nut on it, and a phillips drive in the end of it.
turning it to the left will allow you to tighten the pressure plate screws a little more making the clutch engage better.

it's a 2002 so it may well be time to put a new clutch in it.

John at RJATV.com has some clutch kits that are better than stock and at a great price. and his shipping is always on time.
check him out if you have time.

yes it's a fairly simple job if you have changed an atv clutch before.