2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 111Get this manual
IGNITION COMPONENTS
COMPONENTS
Flywheel
The flywheel contains permanent magnets that energize the sensor and charge coilsOnce the flywheel exceeds minimum cranking RPM, the flywheel's magnetic lines of force passing through the sensor and charge coil windings produce voltage in those circuits
supplied to the power pack to operate the ignition system2
40R, 40RL Models (4 Amp) 1Charge coil assembly 2Sensor coil 3Stator
The flywheel controls ignition timing and charge coil outputThe sensor magnets are in ring around the flywheel hub and the charge coil magnets are in the flywheel rim4050 PL Models (12 Amp) 1Stator and charge coil assembly 2Timer base