Try this to determine whether the gear box is the problem or the clutch. With the engine off, roll the bike backwards and forwards while shifting the gears. Go from first all the way to fifth and back. If you can do this, the problem is with the clutch. If you cannot get it to shift correctly all the way up and then back down, the problem is with the transmission.
If it's the clutch, it's probably dragging. Adjust the clutch. Find the cable adjuster in the middle of the cable covered by a "bellows" made of rubber. Loosen the lock nut and shorten the cable all the way. Remove the derby cover. The adjuster screw is right in the middle of the clutch assembly. Loosen the locknut and turn the screw inwards until it touches. Now, back the screw back out 1/2 to 1 complete turn and lock the locknut. Replace the derby cover. Adjust the cable out until you've got 1/8" freeplay at the lever.
While you've got the derby cover off, stand the bike straight up. Notice the oil level in the primary. It should be no higher than the diaphragm spring in the clutch assembly. The outer clutch drum is made of aluminum. The spring is the black looking disc inside the clutch outer drum. If the oil level is too high, the clutch will "drag" making shifting difficult and finding neutral with the engine running next to impossible.
If it't the transmission, it's probably a broken shifter pawl. This requires a complete teardown of the transmission to repair.
Testimonial: "Excellent Details,was only adjustment of clutch cable to remedy problem. Thank you."
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