Yamaha WR450FN 2022 Owner's Service Manual page 305

ELECTRIC STARTING SYSTEM
4. Joint connector
6. Main relay
7. Engine ground
8. Battery
9. Frame ground
10.Main fuse
11.Starter relay
12.Starter motor
13.Diode 3
14.Diode 5
19.ECU (Engine Control Unit)
33.Engine stop switch
34.Gear position switch
35.Diode 1
36.Starting circuit cut-off relay
37.Clutch switch
38.Start switch
39.Diode 4
A. Battery sub-lead
B. Wire harness
8-6