what will the clutch adjusting screw control? it's so hard for me to explain!!! when I click up on the shift lever, it feels like it will go into gear, It just seems like it's not going quite far enough to drop into the groove, where it will stay engaged........sooooooooooo frustrating!!!! hehehe
That sounds more like the problem is either on the left side with the linkage or on the inside of the crankcase. Let's hope it's the linkage, because if it's not, then you will have to split the cases which is a bad job.
As long as it's not running, it should actually shift into every gear, even if you don't have all the pieces in the right side put back. I would check the linkage on the left side and see if it looks OK. Here is a picture.
There's a little roller on the bottom arm, in the picture, that fits in notches around the shift drum. That's what makes it stay in each gear. See if that's working right when you change gears.
Once you get everything in place on the left side, make sure you put the left side cover back on, because if you don't, when you put the clutch lever back on the right side, it will push the shift shaft back out the left side.