If you want to execute adjustments on your own Honda Valkyrie then it is always recommended to have a Workshop Manual for personal reference should you want to know the best way to take off a specific part much like the Gearbox and match it again effectively.
Honda Valkyrie Workshop Manuals will give unique diagnostic guides with regards to your car or truck therefore if something is playing up it will help you ascertain what the problem is and the best way to repair it. Then you are able to evaluate if you can do this by yourself or if the job is just too big you are able to make a reservation for your Valkyrie into a decent car garage.
Honda Valkyrie manual