I am new to the WR forum and need help. I just picked up a stock 2002 WR426 with no mods and am having throttle problems. The bike is very twitchy at low throttle. It lurches when you let up on the throttle and then re-apply it. The best way to describe it is it is almost like the chain is way too loose. I have a 2003 WR450 that rides nothing like this (it has all the mods though). The 2003 has a smooth throttle transition. Any ideas what it may be? I did check the throttle cables and they are OK and move freely with very little freeplay. Thanks~!