Yamaha YZ450FX 2021 Owner's Service Manual page 285

IGNITION SYSTEM
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
6. Engine ground
7. Battery
8. Frame ground
9. Main fuse
10.Starter relay
11.Starter motor
12.Diode 1
13.Diode 2
14.CCU (Communication Control Unit)
20.ECU (Engine Control Unit)
21.Ignition coil
22.Spark plug
33.Engine stop switch
34.Gear position switch
35.Mode switch
A. Battery sub-lead
B. Wire harness
C. Ignition coil sub-lead
D. CCU sub-lead
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