The clutch cable may be out of adjustment, which is preventing the clutch from fully engaging. Check the clutch cable adjustment and make sure it is within the manufacturer's specifications.
2. Clutch friction plates worn
The clutch friction plates may be worn, which is preventing them from gripping the pressure plates properly. Inspect the clutch friction plates and replace them if necessary.
3. Clutch springs weak
The clutch springs may be weak, which is preventing them from providing enough pressure to hold the clutch plates together. Inspect the clutch springs and replace them if necessary.
4. Hydraulic clutch fluid level low
If your motorcycle has a hydraulic clutch, the fluid level may be low, which is preventing the clutch from fully engaging. Check the clutch fluid level and add fluid if necessary.
5. Damaged clutch master cylinder or slave cylinder
The clutch master cylinder or slave cylinder may be damaged, which is preventing the clutch from fully engaging. Inspect the clutch master cylinder and slave cylinder and replace them if necessary.
6. Other transmission problems
In rare cases, other transmission problems may be preventing the clutch from fully engaging. If you have tried all of the above solutions and the problem persists, take your motorcycle to a qualified mechanic for further diagnosis.