I bent my needle on my 1997 XR250R:bonk: when cleaning my carb. When looking for a new one I notice no one seems to sell a jetting kit with a new needle - my first option. Next I notice that 1996-99 and 2004 come with a 16012-KCE-670. and the 2000 - 2003 come with a 16012-KCE-771. any difference? leaner? richer? The 670 is like $15.00 more for some reason:foul:. Will the 771 work? ANY HELP WOULD BE MUCH APPRECIATED:worthy:!