This project is called the "10cup Mod" since it was invented by a fellow WRR rider known as 10cup on ADV.
The procedure that follows is his. I have only helped to contribute improvements to it as a result of being the first person (besides 10cup) to complete the procedure. We collaborated thoroughly on lots of additional testing to refine the end result. Warning: this was a bold & daring modification which demanded accuracy & precision at every step. Do not attempt this modification, you probably can't do it. 10cup has years of experience working with fuel delivery systems during his Kart Racing days. So, he is obviously more comfortable working with this kind of stuff than the rest of you-uns. As for me, well....I'm just plum crazy!
As of the publishing of this article (Feb 2010), the Safari tank is the only large capacity tank available in the aftermarket for the WRR/X. The fit & finish is quite good, and it seems to perform very well exactly as it comes from the manufacturer. The purpose of this modification was simply to enhance the performance. An attempt at making a good product even better. Here is currently what's inside the Safari tank when you receive it:
It employs one medium capacity Mikuni vacuum pump to transfer (lift) fuel from each wing to the primary Yamaha fuel pump...necessary when the fuel level drops below the primary pump intake. A significant amount of fuel capacity within the "wings" sits below the primary fuel pump sump, and thus, it must be transferred up to it...to be useable.
The reasons that we have performed this mod are threefold: 1) To provide a secondary (backup) vacuum pump system 2) To enhance the fuel delivery rate to the primary fuel pump under highway speed conditions 3) To ensure maximum utilization of available fuel capacity within the tank.