If you have an older WR I'd suggest you remove the throttle slide and check the flat plate that sits in front of it carefully. Last week I backed off the throttle after a long WFO stretch and my bike acted like the throttle was stuck open a bit. It was idling very high and I had to blip the kill button to get home. I did a quick check and found nothing wrong with the throttle, cables or airbox. I put up a post here and someone suggested that the slide may have come apart. Thanks to aremean_troy TT Bronze Member who told me not to try to start the engine and check the slide. I took the carb apart today and Troy was right. At first glance it looked like only one corner of the slide plate had broken away. On closer inspection I could see a crack running around both sides and it came apart with a little wiggle. The piece that broke away while I was riding didn't seem to do any damage to the engine, maybe because I was full throttle and it had enough velocity to get shot clean through. I read another post where someone wasn't so lucky and chewed up his top end. Some guys suggest that the break may be caused by the slide moving too far in the carb due to modified throttle stop. By looking at this plate and where it sits, I'd say that it vibrates back and forth like crazy with every pulse of the engine. The metal gets fatigued and cracks at edge of the circular indentation. My bike is a 99 and I ride 12 months of the year and have a lot of miles on it. I suggest that it may be worth your while to do a little preventative maintenance and check yours now. Even though it broke, the metal is not soft and is about the thickness of a dime. Better to pull it out the top of the carb than to shoot it through your exhaust.