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?