If you wish to do fixes to your Honda CRF70F then it is always recommended to have a Workshop Manual for a reference if you want to know proven methods to remove a specific component for example, the Exhaust and fit it again in the correct way.
Honda CRF70F Workshop Manuals can offer you specific diagnostic details for your car or truck so if something is faulty it will help you determine what the issue is and tips to resolve it. You can then analyse if this can be done by yourself or if ever the job is too big you can make a reservation for your CRF70F in with a decent mechanic.
Honda CRF70F manual