I need some help from you guys. I have a WR 250X around 1000mi, maintaned. Two things I noticed only in the last few days. 1. The bike slipped out of gear on two different occasions both while shifting. It could have been operator error by accidentaly shifted but I have never done that on any other bikes, or maybe I was used to another bike and caused it. Has not happened since though. 2. The PROBLEM: After the bike is warmed up, as I accelerate from a stop I hear a grinding/rubbing noise, it sounds almost circular if that makes sense. It has happened several times. usually accelerating from a stop or real slow speed and in first or second. I took it to local Yamaha and it ran great, on the way home starts again. I can sometimes make it occur by starting in second and getting on it pretty good. it is a 2 or 3 second circular grinding. After trying to figure it out myself, I have ruled out the CHAIN (tightened/lubed), WHEELS, and more or less isolated it to something internal gearing maybe PLEASE HELP OUT, any ideas would be appreciated, I would like to take them to the dealer with me next time.