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1977 400F2 first restore project
smoothoperator:
Found a post by Ashimoto, anatomy of a 400/4 horn which gave me the means to have a look at mine. Looking out for a new l/h switch at the moment as mine is lacking a horn button. So a natural step to have a look at the horn on the bike. Removed it and put 12V on it and dead as a Dodo. Measured resistance across the terminals and it was open circuit. Removed the crimped front part away from the main body to find everything inside looked like new, apart from the contacts which were heavily oxidised. I sanded them in situ as I thought lifting the upper bar up and across might damage it. Checked across terminals and started to show some resistance, can't remember the reading, bit more sanding and then test. Just holding the front cover on and applying 12V I now have amazing Mallard impression device. Bit more tweaking and now its starting to sound like a horn. Externally it's very manky however at least now I know it's worth resurrecting and it's one more part of the bike that can stay original. Felt a bit like a Frankenstein experience. To quote Ashimoto, "More power Igor".
Pics of Horn
https://photos.app.goo.gl/vkiiYBA7onCjZ7pe9
smoothoperator:
Continuing the electrical theme, I thought I should add an image of the fuse box, sigh.
https://photos.app.goo.gl/a1kTapbnv5tG81fN7
Nurse Julie:
--- Quote from: smoothoperator on November 16, 2020, 07:26:07 PM ---Continuing the electrical theme, I thought I should add an image of the fuse box, sigh.
https://photos.app.goo.gl/a1kTapbnv5tG81fN7
--- End quote ---
🤣 🤣 🤣 🤣 I just love people ingenuity when it comes to fuse boxes (or is it bodge 🤔). I'm sure it got the rider home though and that's all that matters.
McCabe-Thiele (Ted):
--- Quote from: smoothoperator on November 16, 2020, 05:33:59 PM ---Found a post by Ashimoto, anatomy of a 400/4 horn which gave me the means to have a look at mine. Looking out for a new l/h switch at the moment as mine is lacking a horn button. So a natural step to have a look at the horn on the bike. Removed it and put 12V on it and dead as a Dodo. Measured resistance across the terminals and it was open circuit. Removed the crimped front part away from the main body to find everything inside looked like new, apart from the contacts which were heavily oxidised. I sanded them in situ as I thought lifting the upper bar up and across might damage it. Checked across terminals and started to show some resistance, can't remember the reading, bit more sanding and then test. Just holding the front cover on and applying 12V I now have amazing Mallard impression device. Bit more tweaking and now its starting to sound like a horn. Externally it's very manky however at least now I know it's worth resurrecting and it's one more part of the bike that can stay original. Felt a bit like a Frankenstein experience. To quote Ashimoto, "More power Igor".
Mine came without a horn or any mounting bracket if there is one. That will be one of the last things I sort out.
Pics of Horn
https://photos.app.goo.gl/vkiiYBA7onCjZ7pe9
--- End quote ---
smoothoperator:
Had the handlebar switches off, fixed the kill switch issue as far as I can tell at the moment. Replaced the left hand switch with a new reproduction unit due to the missing horn switch. Put the handlebars back on. Refurbished the horn. I need to replace the short green wire from the loom to the horn as it was open circuit at the spade end. This horn really doesn't want to work. On the hunt now for spade connectors and some 3 and 4 way connectors to complete the wiring up of the headlight, some of the connectors in the headlamp bowl are in poor condition. It was tempting to continue stripping the bike down but I have resisted. I'm learning a lot by putting things back together and I'm sure this will help later down the line. I've also been picking up ideas on engine rebuilds and in particular found a very entertaining Australian guy on Youtube who has detailed rebuilding a 350/4 which clearly shows just how much they have in common with the 400.
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