The magneto has 2 separate outputs - 1 to the ignition and 1 to the accessories (AKA Lights). If you are sure that you have power coming from both parts, then you need to check your switches (On/off switch and Key Switch).
If they test OK, then check your spark plug wires for continuity. If that is OK, then you need to check your coil (There are coil tests on YouTube).
If your coil is functional, then the last thing to replace is the CDI. Unfortunately, there aren't any tests for that. It is either good or bad. You can and should check the pickup gap for the CDI - (Distance between the pickup and the flywheel at a predetermined point - typically a thicker or raised point on the flywheel).
The magneto armature is attached to the crankcase next to the flywheel. It can be located by following the spark plug wire. This leads directly from the spark plug to the magneto.
Br8es
If you have access to a spark tester, use it. Otherwise, remove the spark plug, reconnect it to the spark plug wire, and rest the tip or threads on a good engine ground, AWAY from the spark plug hole. Attempt to start it, and watch for spark. If none, replace the spark plug and try again. If still no spark, the magneto coil may be faulty.
air gap improperly set between fly wheel and magneto, bad coil, spark plug harness. Would not hurt to check the spark plug gap and ensure the connector end is tight
I believe its .020 with a magneto.
No, a magneto is what creates electricity to send to the spark plug. Without a magneto, any gasoline engine will not run because it will not have a spark.
There is a "Flywheel" inside the motor that has a large magnet on it. This magnet passes a "Magneto" and that passing (EMF, Electro-motive force) causes a high voltage charge to provide power to the plug.
Nrg br8 es
Fouled spark plug(s).
If you have access to a spark tester, use it. Otherwise, remove the spark plug, reconnect it to the spark plug wire, and rest the tip or threads on a good engine ground, AWAY from the spark plug hole. Attempt to start it, and watch for spark. If none, replace the spark plug and try again. If still no spark, the magneto coil may be faulty.
Check the spark plug. It could be flooded. Clean the carb
No--a voltage regulator would prevent a battery charging. Your dirtbike most likely has a magneto, feeding a coil or spark exciter. Test park by pulling spark plug, reinserting plug into plug wire, grounding electrode on motor head, and turning over engine. You should get a "blue," audible spark. A weak yellow spark indicates a bad coil; no spark is usually a failed magneto--quite often the shear-pin has been sheared, and the magneto is now out of timing. All of these fixes are pretty easy, a new coil being the most expensive.