How do you test a coil on Yamaha?

To test a coil on a Yamaha motorcycle, first, ensure the ignition is off and disconnect the coil's wires. Use a multimeter to measure the resistance across the primary and secondary terminals of the coil; refer to your specific model's service manual for the correct resistance values. If the readings are outside the specified range, the coil may be faulty and should be replaced. Reconnect everything and perform a spark test to ensure proper functioning.