Yamaha SR400 2014 Service Manual page 261

IGNITION SYSTEM
1. Battery
2. Main fuse
3. Main switch
4. Ignition fuse
5. Engine stop switch
6. Ignition coil
7. Spark plug
8. ECU (engine control unit)
9. Sidestand switch
10.Diode 1
11.Neutral switch
12.Negative battery lead
13.Frame ground
7-4