If you have to perform maintenance tasks for your Suzuki Boulevard C109R then it will always be a good plan to own a Workshop Manual to use as personal reference in case that you need to know the best ways to take out a specific part for example Gearbox and install it again properly.
Suzuki Boulevard C109R Workshop Manuals offer you specific diagnostic information on your vehicle therefore if something is broken it helps you identify what the situation is and tips to fix it. After that you can determine if this can be achieved yourself or if the job is simply too big it is possible to book your Boulevard C109R in with a nearby mechanic.
Suzuki Boulevard C109R manual