250-500cc top end rebuild

I am going to be putting in a new top end on my 09 wr300. I am having a hard time figuring out what the manual is telling me to do. I am wondering what it is I need to do with the powervalve? Do I need to disconnect something? Or will the cylinder come off without messing with it? I am just afraid of throwing off the timing, since I am not sure how to get it back together with proper timing. My first time pulling the jug on this one, and want to get some info before I dig in. Any tips are GREATLY appreciated!

Check on page 2 (installation of the WB165) and see if your 300 looks like the 125/165. If so it will be a big help to you. If the 300 PV is like the 125's it's very easy to take the linkage off and nothing will get out of time.

The linkage is on the other side from the 125 but isn't any tougher. The linkage disconnects pretty easily.

Just pry the plastic arm off one of the balls.

Dont be afraid it won't break.

Drain the coolant before you take off the head.