The clutch is dragging or the primary has too much oil in it. In either case, the transmission is almost impossible to get into neutral with the engine running.
To properly adjust the stock clutch, find the cable adjuster in the middle of the cable. Loosen the locknut and turn the adjust barrel all the way in giving as much slack in the cable as possible. Remove the derby cover on the primary cover. Loosen the locknut on the adjuster screw in the center of the clutch assembly. Turn the adjuster screw inwards until you feel a resistance. Do not force the screw. If necessary, back the screw off and adjust inwards several times to get the "feel" of what you're doing. Turn it inward just till you feel the resistance. Then back the screw back out 1/2 turn. Lock the locknut down and reinstall the derby cover. Go back to the cable adjuster and turn it outward until you have about 1/8 inch of freeplay at the lever.
Overfilling the primary will also make the clutch drag. The oil is up between the clutch plates and it acts like the transmission fluid in the torque converter of an automatic transmission in an automobile. If you look at the clutch assembly with the derby cover off, you'll see that the outer clutch shell is made of bright aluminum. Just inside that, the clutch spring is a darker colored steel. With the bike standing straight up, fill the primary with oil just up to the lowest point of that spring, no higher.
Warped steel clutch plates can also cause the problem you're having.
Good Luck
Steve
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