Yamaha YZ450F Owner's Service Manual page 295

IGNITION SYSTEM
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
5. Condenser
7. Engine stop switch
8. Neutral switch
9. Launch control switch
10.ECU
11.Ignition coil
12.Spark plug
19.Ignition coil sub-lead
8-3