Yamaha 2009 YZF-R1 (Y) Service Manual page 393

IGNITION SYSTEM
1. Main switch
4. Main fuse
8. Battery
9. Fuel injection system fuse
12.Relay unit
15.Sidestand switch
21.ECU (engine control unit)
22.Ignition coil #1
23.Ignition coil #2
24.Ignition coil #3
25.Ignition coil #4
26.Spark plug
41.Crankshaft position sensor
45.Cylinder identification sensor
46.Lean angle sensor
64.Right handlebar switch
67.Engine stop switch
69.Gear position sensor
100.Ignition fuse
101.Engine ground
102.Battery negative lead
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