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Anorak's Corner / Re: Anatomy of a 400/4 Horn (also CB250/360 G5)
« on: May 28, 2024, 11:17:44 PM »
Update on this.
I found a couple of Honda CB400F style Genuine horns in my stash the other day that were totally dead. My rig to inject EHT to arc across the contacts in order to revive them.... as described on here previously ... was at work. So I tried removing the M4 adjuster screw/lock-nut completely and with 12v connected across the terminals I repeatedly pushed down inside the hole with a thin crosshead screwdriver to physically move the contacts apart and together again. After quite a few makes and breaks there was eventually a bit of a squeak and the horn started to conduct current, so I carried on making and breaking the contacts and the current gradually increased until the horn worked perfectly, after adjusting the large centre screw and the M4 'tuning' screw. Worked on both horns eventually and worth a try if you have dead horns.
I found a couple of Honda CB400F style Genuine horns in my stash the other day that were totally dead. My rig to inject EHT to arc across the contacts in order to revive them.... as described on here previously ... was at work. So I tried removing the M4 adjuster screw/lock-nut completely and with 12v connected across the terminals I repeatedly pushed down inside the hole with a thin crosshead screwdriver to physically move the contacts apart and together again. After quite a few makes and breaks there was eventually a bit of a squeak and the horn started to conduct current, so I carried on making and breaking the contacts and the current gradually increased until the horn worked perfectly, after adjusting the large centre screw and the M4 'tuning' screw. Worked on both horns eventually and worth a try if you have dead horns.