With the built in stator or rectifier that charges the battery. It is under the flywheel.
A stator. A magnet that rotates with the crank shaft
Stator: This is the device that acts as an alternator. It delivers a charge to your battery to keep up. Most older bikes have to have the engine removed to change this.
Could be a few things. Possible to be the CDI box or the Stator.
An alternator is a device that generates power for an automobile to run its electrical loads and to charge the battery. A stator is one of the internal parts of the alternator, specifically the stationary windings that generate the 3-phase AC.
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Might be a defective voltage regulator (not opening circuit on shut-down) Or a bad stator. (if the battery doesn't charge at all.) Or an electrical short.
Possibilities: 1) You have a bad battery. 2) You have a bad ignition switch. 3) You have a broken or unplugged wire to the charging system. 4) You have a bad charging stator.
A bad stator causes the battery not to charge. That makes the battery light come on. Some other things that can cause the battery light to come on are corroded or frayed cables or connections or a loose/bad ground cable.
A voltage regulator converts a/c volatge from the stator to dc voltage and regulates it down to under 15 volts. When they go bad they can over charge and take out a battery as well as not charge at all.
Two possibles. Either the battery needs to be replaced, or the stator is not charging. First check the battery with the engine off, should have 12. 2 volts or more, if under 12 volts, then charge and check again. If under 12 volts, then replace. If over 12 volts, run engine, check the battery volts, should have over 13 volts at idle, rev up, should get over 14 volts. If battery still shows only 12. 2 or so volts, then the stator in the engine has to be replaced.
A stator and a magneto quite similar except a stator system requires the presents of power inorder to generate power and as for the magneto generates its own energy, a stator inside state magneto outside state.