Yamaha TZR250 (1987) [263/333] Ignition and starting system

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IGNITION AND STARTING SYSTEM IGNITION CONTROL CIRCUIT OPERATION The ignition control circuit on this model consists of the ignition control unit neutral switch neutral indicator light and the sidestand switch If the engine stop switch and the main switch are both on the ignition spark can produce only if 1 The transmission is in neutral the neutral switch is on 2 The sidestand is up the sidestand switch is on a a a Transmission Neutral switch Neutral close Neutral close IN gear open IN gear open ELEC S Sidestand Sidestand switch Up close Down open Up close Down open Bypass current flows into the thyristor which is thus turned on thereby grounding the current of the source coil In this way no sparks will be produced Ignition control unit 2 Sidestand switch 3 Neutral switch C D I magneto 5 C D I unit Ignition coil 7 Spark plug Thyristor Bypass current S S

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