The horn has an adjustment inside. Pop open the horn shell, you will see where to pry. Inside you will see a screw/spring. Can't miss it.
Unscrew the screw out a turn or two and test the horn. I test my horns using a 6 volt latern battery. The contacts on the horn match up well with the contacts on the latern battery.
Adjust the screw back and forth until your happy with the sound. If the screw is turned in to tight or out too far, the horn will not sound.
The horn is not very loud. If you want nice sound, you may have to go with a 6V aftermarket horn from a Vespa or the like.
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