well if its anything like some of the ones i have changed out, its as simple as removing the clutch cover, remove the kicker shaft and gear and slap a new one in it, new gasket and put it back together. i dont think they are all that hard to change.
1985 KXT 250 Tecate - kx cylinder, kx ignition, bassani headpipe, answer silencer, v-force reeds, 38mm airstyker carb, +2 franks swinger, raptor rear shock.
1996 YSF240 Blaster - maxxed out!!!
Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "HOLY SH-T, what a ride!"