You might need a clutch replacement if gears are slipping during engagement and you have done a clutch re-learn procedure, or you the machine will not complete a clutch re-learn (sometimes accompanied by the clutch temp light).
If you don't want to attempt this yourself, and or nearby or willing to travel, Adam Brown with AB Custom Fab in Alabama is an expert in clutch replacements. Contact him via Facebook at https://www.facebook.com/abcustomfabrication
If you fell you are sufficiently mechanically inclined to replace them yourself, here are the parts you will need:
Parts Required:
1x CLUTCH COVER GASKET 11397-HL4-003
1x REDUCTION COVER GASKET 11398-HL4-003
1x OIL TANK COVER GASKET 15615-HL4-003
4x O RING 91302-RGC-003 (35x2.2)
4x O RING 22814-RGC-003 (21.2MM)
2x O RING 22815-MGE-D01 (28MM)
2x CLUTCH 22500-HL6-A01
Supplies to change the oil, you can find the list here
Service Manual for instructions