Anatomy of a 400/4 Horn (also CB250/360 G5)

[ozzybud]

Wow, that price is eye watering  . Just shows how expensive these individual parts are becoming and why it is difficult to justify restoring a bike to original spec and then of course you have to ask yourself the question 'If I have spent all this money restoring it should I ride it and ruin it'. This is why I'm trying to restore Ratty back to stock but have no problem using stainless fasteners where I can for practical reasons. I do however remove the stampings from the bolt heads and polish them to give a decent finish.

I got it for far less than the asking price. just made a low offer and they accepted.

I have the OCD gene that makes me want to restore as close to original as possible.. And I do ride all my bikes.

I was restored myself with a heart transplant 13 years ago . So i live every day to the fullest. Would be a shame to just look at a pretty bike then let someone else ride it after i pass..

[McCabe-Thiele (Ted)]

Wow, that price is eye watering  . Just shows how expensive these individual parts are becoming and why it is difficult to justify restoring a bike to original spec and then of course you have to ask yourself the question 'If I have spent all this money restoring it should I ride it and ruin it'. This is why I'm trying to restore Ratty back to stock but have no problem using stainless fasteners where I can for practical reasons. I do however remove the stampings from the bolt heads and polish them to give a decent finish.

I got it for far less than the asking price. just made a low offer and they accepted.

I have the OCD gene that makes me want to restore as close to original as possible.. And I do ride all my bikes.

I was restored myself with a heart transplant 13 years ago . So i live every day to the fullest. Would be a shame to just look at a pretty bike then let someone else ride it after i pass..

Blimey a heart transplant  that some heavy duty surgery - Dick Cheyeney (ex USA VP) is still going well with his at 83 years- respect to both of your restorations!

[AshimotoK0]

Well I got a really nice Honda Mitsuba horn that will re-plate beautifully but it was completely dead and non of my methods described in this thread worked to revive it

So put my thinking cap on and used the rig below which zaps a few hundred volts of high frequency AC (12v-> high volts inverter) across the horn terminals via a 33 Ohm limiting resistor. The inverter was modified as the output in normally 50Hz but I bypassed all that and simply  used simply the high-frequency output from the inverter transformer   Worked a treat and you get an audible fizzing when you get conduction and the corrosion is being eroded away. This is my go-to method in future for sure.

Had the inverter PCB module for ages but it basically came out of something like this one.

https://www.ebay.co.uk/itm/185519092553

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[Laverda Dave]

You have a bit of a production line in horns going on there Ash . All those electronics in something costing just over £5! I remember when I was in the electronics club (it was an after school activity to keep us off the streets) in the 70’s we made a lie detector. To make it we had to buy a new piece of technology called an Integrated Circuit Board, it cost a small fortune. Tomorrow's World called them the future and they were right. Amazing how cheap all this technology has become.