Worn synchronizer ring

Replace synchronizer ring

Worn synchronizer sleeve or gear

Replace sleeve or gear

Bent or distorted shift shaft

Replace shift shaft

Excessive free travel of all gears in axial direction

Replace gear

Worn bearings on input shaft or counter shaft

Replace bearings

Poor adjustment of clutch cable

Adjust clutch cable

Distorted or broken clutch disc

Replace clutch disc

Damaged clutch cover

Replace clutch cover