2021 Yamaha MT-10 Service and Repair Manual
MT10MB is the model code on a 2021 MT-10, the last year in this generation, and Yamaha's service volume for it is LIT-11616-31-48.
That same part number reaches back to 2018 and covers 2019 and 2020 as well. Yamaha documented the four seasons together, describing the common work once and identifying the year-specific points where they arise, so the 2021 sections read against a baseline established earlier in the run.
Use it as service material, not reading material. The procedures are sequenced in the order a technician follows them, fasteners carry torque values, clearances and adjustment figures are stated as measurements, wiring diagrams lay out the electrical circuits, and the troubleshooting routines move from symptom to probable cause.
Read the code on your machine first. If it is MT10MB, LIT-11616-31-48 is the correct reference.