Here are a few things to check:
- Seizures mostly occur because:
>- Low oil levels.
>- Incorrect carburetor settings.
>- Dirty or damaged air filters.
>- Ignition problems.
>- Fuel supply issues.
>- Improper maintenance of internal components.
To fix a seized engine will require significant engine work and potentially replacing damaged components.
It's important to consult a professional mechanic or refer to your bike's service manual for specific instructions and procedures.