Originally posted by yfzrider45
If i pull it will oil start flowin out lol, i have a full tank....
You will need to drain your tank. Do this during your next oil change.

Originally posted by ktmbill
If you are cleaning the screen not all the stuffs on the screen, and you should take the oil tank out and clean it and the oil lines to the motor.
Note if you do not change the cam chain it will eat the plastic guides that will plug up the screen & oil lines. I have rebuild 16 YFZ 450 motors and the cam chain makes a mess.
their is a screen in the motor as the pick up tube but you have to spilt the cases, to help clean that screen spray carb cleaner in the drain plug in a upward spray.
Does this happen after a certain amount of hours or abuse on an engine? I've had my head off several times when messing around with the cam mod (I think I can do it in my sleep now) and I've never noticed any abnormal wear in the plastic guides. I have no idea how many hours I have on my engine but it's quite a few and it's still running strong. Valves are still in spec, never had to shim them!