How do you check the ignition on a 1987 XT 600 Yamaha?

To check the ignition on a 1987 Yamaha XT 600, first ensure the bike is in neutral and the kill switch is in the "run" position. Use a multimeter to test the primary and secondary windings of the ignition coil; the primary resistance should be around 0.6 to 1.3 ohms, and the secondary resistance should be between 6,000 to 14,000 ohms. Additionally, inspect the spark plug by removing it and checking for spark while cranking the engine. If there's no spark, further investigate the ignition timing and the CDI unit.