Yamaha YZ450FP 2023 Owner's Service Manual page 307

ELECTRIC STARTING SYSTEM
5. Frame ground
6. Battery
7. Fuse
8. Starter relay
9. Starter motor
10.Diode 1
12.ECU (Engine Control Unit)
21.Gear position switch
22.Handlebar switch (left)
25.Engine stop switch
26.Handlebar switch (right)
27.Start switch
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