Allo and welcome along
the list you want is here -
http://www.xt660.com/showthread.php?t=630
The list is done by the forums very own XT660 tech Guru Kev, it's a list of mods and fixes for known niggles.
Kev also does a cheap fuelling mod which does exactly what you are asking for. This can be found here,
http://www.xt660.com/site/node/136
or here
http://www.xt660.com/showthread.php?p=140099#post140099
enjoy!
Pete.
P.S. why not start a thread in the newbies section and introduce yourself properly?