Yamaha WR250F 2022 Owner's Service Manual page 303

IGNITION SYSTEM
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
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)
20.Ignition coil
21.Spark plug
33.Engine stop switch
A. Battery sub-lead
B. Wire harness
C. Ignition coil sub-lead
8-2