I suggest you adjust your jets first.

While tweaking the jets on my bike, I tried the Lean side but not as lean as the Factory.   Boy, the bike was noticeably hotter.

pitbullcustoms wrote on 07/08/09 at 13:47:43:

No, there should be enough restriction in the stock oil path to cause the oil to flow thru the cooler.  In fact, I don't think you need to route the oil lines as shown.  There's an second oil port on the bottom of the engine to connect to.  The stock oil path has a restriction that will cause approx. 50% flow thru the cooler.  About right in my opinion.

Here's the one I am using before I shot it with black paint.
http://bikepics.com/pictures/654677/
I think it came off a GXS and adds about 3/4 of a quart of oil to the crank case. I made the fittings for the lines out of aluminum and had to drill and tap a return line in the side cover above the oil filter which was a little tricky. About half the flow goes thru the cooler once the engine gets hot, the other half uses the stock oil flow pathway. It is possible to block off the internal path and run completely on the cooler, I just didn't do it.

My setup runs a line from the front oil port thru the cooler and over to the oil filter cavity. I was thinking about returning the oil to the crankcase thru the drain plug but realized that by doing that I would just be pumping oil back into the crankcase instead of up to the engine where it is needed which is no good. I was concerned about oil starvation on the top end at startup which is why I split the flow with half still using the internal pathways. I couldn't find any easy hookup for a return line off the cooler which is why I drilled and tapped the side cover above the oil filter.

Are you sure that the oil needs to be cooled?  You can search for the posting where a thermometer was installed into the oil fill port to actually measure the oil temperature.

Engine oil temperature of 180° to 220° is "normally warm."  When the oil gets up to 240° or higher is of concern.  Even at 200° to 220°, the first thing I'd do would be up upgrade to 20W-50 motorcycle oil.  Even better would be xW-50 synthetic oil.

As said above, both the engine and the oil cooler need air flow.  Why not install a 12v fan activated by a Klixon type thermostatic switch in the head.  It could just blow over the head when it reached a high temperature, or if you really want a project, blow over the oil cooler when it exceeded 220°...providing you can route the oil through the cooler so it does not rob any oil from the engine.

pitbullcustoms wrote on 07/09/09 at 03:39:06:

Not exactly.

The oil needs to be "normally warm"  so the flow of oil is what the engine designers intended.  Normally warm engine oil is above 180°.  Permacool sells a thermostatic valve to install with their oil coolers that begins to send oil through the cooler at that temperature.