Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: Eldrick on March 20, 2023, 05:31:35 PM
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What is this bit linked to the Coils?
[attach=1]
It was zip-tied under the fuel tank, at the rear, under the rubber cusion and the wires go to each coil.
Is it a genuine part and should it be under the tank? It works, as in the bike starts but as I am re-wiring it with a new loom I want to know what it is and where it should live.
Thanks.
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Could it be a junction box?
Does it open?
I've just rewired my 400/4 and the loom to coils connection is under the tank, but just sleeved bullets so I assume this is a mod you have.
Here's an image of mine.
Ignore the fact that the coils are the wrong way round.
Ignore the fact that both coils have a yellow and black instead of one having a yellow and black and the other a blue and black (after market coils, the starboard coil is the one that should have a blue wire and is for pots 1&4)
Ignore the fact that it has no carbs on it, (this could be a clue to to the poor running)
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Whatever it is its not standard.
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From the colours of wire and number of them, plus linked to coils, suggests it's electronic switching of coils, possibly.
Does the wire route go to just the coils ? Or points ? Is it interlinked with those ?
More pictures of it to see detail.
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[attach=1]
This is how it links to my coils, there is also one other wire, a ground, that connatcs to the frame under the seat.
The box does not open, it is a sealed unit.
It does not itself connect directly to the points.
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It looks like an early Boyer ignition box
Check under the points cover
Sent from my SM-A750FN using Tapatalk
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John beat me to it ;D look under the points cover to see what's there.
Another picture :)
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[attach=1]
OK, just looked there, I know nothing about that so here is a photo.
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Yep, electronic ignition.
That bit provides the timing pulse as the crankshaft rotates, then the box up by the coils interpretss that signal and switches the coils on and off to make the sparks.
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Yep, electronic ignition.
That bit provides the timing pulse as the crankshaft rotates, then the box up by the coils interpretss that signal and switches the coils on and off to make the sparks.
Is that a 'good thing'? I guess if the bike isn't broke don't fix it is my first thought, if anyone has different thoughts, let me know.
thanks.
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My personal opinion is it's great
Have it on my 500,
Search Boyer ignition
Its still being made
Instructions and wiring diagrams can be seen, and downloaded
Read,
Ask any questions,
Sent from my SM-A750FN using Tapatalk
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My personal opinion is it's great
Have it on my 500,
Search Boyer ignition
Its still being made
Instructions and wiring diagrams can be seen, and downloaded
Read,
Ask any questions,
Sent from my SM-A750FN using Tapatalk
just got on the website
http://www.boyerbransden.com/pdf/KIT00055__BOX00014_.pdf
other info available,
use resister plug caps, NOT resister plugs
ideally have your ignition timing checked with a strobe,
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Definitely a good system.
Replaces the Honda's points/mechanical system ( good in itself) with electronic triggering and switching with effectively no wear items.
Usually very reliable too.
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Anyone know what the extra current draw is to power the transistor box?
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The box very little but boyer tend to fire the coils together so the coil load is doubled