I have a 2005 KTM 300 EXC. I am using stock gearing. Has anyone changed to a larger rear sprocket and if so how much larger. Trying to get rid of a little lag in acceleration in second and third gears. Have done the jetting thing and runs good everywhere except for the lag in second and third gears. Had a 2000 300exc and it ran better. I don´t remember the gearing on the 2000.