Easy peasy. Remove shift lever, left cover (foot peg first? dunno), two bolts for sprocket, sprocket. Clean area real good run 1-2 drywall screws into seal to pull seal out. clean shaft so some masking tape will stick. One layer of tape on shaft to protect new seal. Pack inside of seal with grease(spring goes inwards). Use whatever is handy to Lightly/gently drive new seal, stopping when seal is flush with case. Install remaining parts, little loctite on sprocket screws won't hurt.