SOHC.co.uk Forums > CB500/550
Has anyone used these coils?
McCabe-Thiele (Ted):
--- Quote from: beardylondon on May 27, 2024, 09:03:53 AM ---Yes, red and white wires are o new coil and yes they are supplied overly long.
Thanks for the tip!
--- End quote ---
FWIW my Hendler coils were wired for positive earth so I had to switch them to negative earth - this caused clearance issues in the mounting position so I had to ensure the spade terminals did not touch the frame on the inside edge.
The Devil is in the detail when fitting aftermarket options.
beardylondon:
thanks.
can you remember if the red was positive? when you switched, do you mean you put the red on the white terminal and white on the red terminal?
I've messaged who I purchased them from.
but how can I can test which terminal is which?
--- Quote from: McCabe-Thiele (Ted) on May 27, 2024, 10:04:29 AM ---
--- Quote from: beardylondon on May 27, 2024, 09:03:53 AM ---Yes, red and white wires are o new coil and yes they are supplied overly long.
Thanks for the tip!
--- End quote ---
FWIW my Hendler coils were wired for positive earth so I had to switch them to negative earth - this caused clearance issues in the mounting position so I had to ensure the spade terminals did not touch the frame on the inside edge.
The Devil is in the detail when fitting aftermarket options.
--- End quote ---
McCabe-Thiele (Ted):
My black Hendler coils are white coloured at the ends where they are sealed and the terminals fit.
There was a black + sign on the positive side moulded into the white ends.
If your coils have no markings on the body at all then I would guess the red connections are most likely positive.
If the coils are connected the wrong way round the bike will run but the HT spark will be reversed so instead of jumping from the centre spark plug tip to earth the spark path is reversed. Not sure what difference this makes in the long term as I know nowt about that sort of theory. I have read that electron flow is not the way most folk think i.e. +ve to -ve but is the reverse.
Folks here will know about the Electronics side of things.
deltarider:
First, I hope you all enjoy your cheap generic coils of unknown quality and further...
--- Quote from: McCabe-Thiele (Ted) on May 27, 2024, 01:58:52 PM ---[...]
If the coils are connected the wrong way round the bike will run but the HT spark will be reversed so instead of jumping from the centre spark plug tip to earth the spark path is reversed. {...}
--- End quote ---
To put it simple: in a wasted spark system, one of the two, is already jumping from ground to center electrode, so if the spark of say #1 plug becomes reversed, than the #4 plug will be reversed the other way around, because they are one circuit. For the running of the engine, it makes no difference which of the two fires from ground to center electrode: performance is the same.
beardylondon:
Tried and tested by a forum member, hardly unknown!
--- Quote from: deltarider on May 27, 2024, 07:07:20 PM ---First, I hope you all enjoy your cheap generic coils of unknown quality and further...
--- Quote from: McCabe-Thiele (Ted) on May 27, 2024, 01:58:52 PM ---[...]
If the coils are connected the wrong way round the bike will run but the HT spark will be reversed so instead of jumping from the centre spark plug tip to earth the spark path is reversed. {...}
--- End quote ---
To put it simple: in a wasted spark system, one of the two, is already jumping from ground to center electrode, so if the spark of say #1 plug becomes reversed, than the #4 plug will be reversed the other way around, because they are one circuit. For the running of the engine, it makes no difference which of the two fires from ground to center electrode: performance is the same.
--- End quote ---
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