Can anyone tell me why I can't find a leak jet on any schematic I look at for my carb? I've looked at multiple shops online and walked into a couple to ask the parts guys... They either say that my bike (03 wr450) doesn't have a leak jet (which it clearly does) or that it's not listed since Yamaha didn't want you messing with it (sounds like crap to me). I've pulled the leak jet, seen that it has a size number on it (like any replaceable jet does), but after looking at schematics for 2002 WR426 through 2007 WR450, none of them point out an upgradeable leak jet! Why would that be?