I got a 07 pitster pro x4 with gpx 125 motor. Bikes been great but have a problem with 3 gear jumping out and sometime missing down shifts from 3to 2 nd gear. I was talking to guy from Edmonton thathad fixed this problem on his bike and other and was going to send him my motor and fix it and also do cam and hi-comp piston. I can not get hold of this guy and wonder is there anybody else than wants to do this repair I believe it got to do with puting 140 shift forks in trans. I have never tore down motor this far and want somebody who know what there doing to fix it. Thanks for any help.