i always thought why cant you buy a reserve petcock to go on your yz? well you can. just order 1 for a 2003 ttr 125 (wich is around $17, thats cheaper than the wr) and swap the ends. apply some glue or yamaha bond to hold the end in and you will now have reserve on your yz. its 1 cheap mod that will save you when you run out of gas in the middle of the woods, if you do woods riding with your yz.