Read the instructions. What you do to your bike is at your own risk.

First off remove the tank see thread here.

http://www.xt660.com/showthread.php?t=8876

If you're going to block the AIS then it's this pipe and this thread here.

http://www.xt660.com/showthread.php?t=11113

The PCV connects inline with the Fuel Injector and the Throttle Position Sensor.

The FI is easy enough but the TPS is hidden away on the right side behind the frame tube.



It's a bit of a fiddle to get the plug off.

Even more of a faffon to get the PCV plug back on, you have to think about where the wires will route back and wiggle the plug about so it lines up with the TPS, so use a bit of thought before connecting up, there's not much room for fingers. Side view below the TPS sits behind the frame tube.



I tided up the extra wires with a few tie wraps to keep em off the head.
I'm going to put the PCV unit in front of the battery with a bit of foam padding.



I then connected up the loose tank and started the bike just to make sure nothings amiss, and looks OK.

* Warning *

The plastic clip on the fuel line is very brittle I snapped half the end off without any trouble so take care when getting it off/on.