I was sick of waiting around for GPR, so I took the rebuild into my own hands. If they don't want my money, then screw 'em.
After opening up the unit, I realized that it is a VERY simple device! Not much to it at all. Pretty neat actually. From what I understand, the V4 unit at the begining of its run, had a bad o-ring that sealed the two halves of the case. Later units had this issue fixed. However, mine was never serviced and was one of the first run units, so oil leaked out. When I recieved it from one of our forum members (thanks again man!), it had almost no oil in it and barely worked at all.

Here's the crap load of parts these things are made out of.


This is the o-ring that needed to be replaced. I replaced it with one that was slightly thicker in dia.


Since the unit was cracked open, I replaced all the o-rings & seals. Then, started to assemble it. The best way to do this without getting air inside, is to place the unit into a small container and submerge it in the oil. Then assemble while under the surface of the oil. The unit does have two bleeder screws on the back to fill it and remove air, but submerging in the oil is not only quicker, and easier, but this way you know there will not be any air inside. I used some leftover fork oil, 10 weight I believe.


Don't forget locktite! In this photo, you can see those bleeder screws I was talking about.


All cleaned up. I'm using these chunks of aluminum to mount the GPR V4 to my Superhawk. That's for another thread...

 

Thanks for posting this as I'm currently in the market for one and I wasnt about to pay $500 for a Scotts damper. Still looking....

 

Just an update to this. I'm not exactly sure why yet, but while the bike was sitting for several months during winter, the unit started to weep a little bit of oil. It was coming from between the two halves. This is the thicker than stock o-ring that I replaced too.

So, I deceided to get a hold of GPR via email this time, and someone was actually kind enough to write me back. I was told that all GPR V4 stabilizers are serviced for free! I pay a few bucks to ship it to them, they service it, and then send it back to me on thier dime. So, I sent it in and am currently waiting for it to return.

Edit: Update, GPR returned my V4 and after several rides, everything works as it should with NO leaks.

If you can't spare the down time, then rebuild it yourself, otherwise send it in. With insurance, it cost me ~$9 to send it in and have it rebuilt by GPR.