All three kicker gears have to be changed as a group. The one in the center of the clutch basket, the idler, and the one in the kick shaft. There are 3 different combinations of those gears, and they differ in tooth count as well as width. If you change from wide to narrow or vice versa, the main trans bearing behind the clutch basket must be changed too. The narrow gears call for a commonly available bearing, the wide ones use an odd, narrow, Honda specific bearing, still available for late model xr200's. This alone won't make it forward kick though. That is accomplished by using the 200x kick spindle, clutch cover, external gears (inside the clutch cover) and kick lever.
1985 Tri-Z 250
1985 ATC250R