Has anyone used these coils?

[beardylondon]

Starting a new thread, has anyone bought these aftermarket coils?

https://www.davidsilverspares.co.uk/CB550K-1976-USA/part_83533/

Ash said I should ask everyone as the primary coil resistance should around 4 to 5 Ohms, I asked DS this afternoon and they said they do not have this technical information!

[Oddjob]

Then don't buy them. If they can't supply that information you can have a reasonable assumption it's wrong or they'd be willing to tell you.

[McCabe-Thiele (Ted)]

I fitted these (Hedler) as they are probably a temporary measure until I restore my originals.
They are Primary  5.11 Ohms - S 17.55 Ohms  made by Hedler the spec is on Hedlers website p/n 540612H
I did mot use the screws shown in the picture mounted them in the original saddle at each end.
I switched the wiring so the poitive marked terminal was on the ignition feed side.
At £29.95 each did not break the bank.(inc post)
Just made a chain link type bracket for the bottom mount as they are 90mm not 100mm centres. Might need more work if you wanted to fit them facing backwards.

.
https://www.ebay.co.uk/itm/151925589049

I think DS would tell you the brand if you asked them.

[McCabe-Thiele (Ted)]

If you zoom in the DS photo they look like Tec FL 703 12v as does the part description.

That is the same  Tec part number on my original looking coils.

[deltarider]

In short: primary resistance should be advertised. Always. Original coils are 4,3 - 4,7Ω. Products from China are to be avoided, unless a well known western or Japanese brand has chosen their products to be manufactured there. In that case those products will carry the name of the brand. No brand means no one will accept responsibility. Your choice.
What we're witnessing now, is another wave in posts about coils. It seems contagious.

[McCabe-Thiele (Ted)]

I'm pretty sure that I read it here somewhere that DS went to Honda's original manufacturer's Tec to supply them.
It has been my experience that Chinese products do not stand still when it comes to improving quality either as direct suppliers or sub- contracting for well know brands.
What was true of a  product 2 years ago can be a very different experience today.
The reality is that it's virtually impossible to buy top brand products today that are not either made there or they supply the components for. Miele is the only true German made product I can think of.

[beardylondon]

You are mistaken, as if you zoom in photo in the link in my first post, the "aftermarket" coil there's no part numbers

https://www.davidsilverspares.co.uk/CB550K-1976-USA/part_83533/

But if zoom in on the more expensive OEM type, then you can clearly see FL 703, below and yes it says TEC in description

https://www.davidsilverspares.co.uk/CB550K-1976-USA/part_370607/

If you zoom in the DS photo they look like Tec FL 703 12v as does the part description.

That is the same  Tec part number on my original looking coils.

[McCabe-Thiele (Ted)]

Were at cross purposes here I was looking at the OEM replacement never saw the cheaper ones.

The Hendler ones look to be a half decent unit plus they have a UK website.
https://www.hendler.co.uk/category/ignition-coils

More to the point the retailer I used via e-bay is local so if I have an issue no postage involved.- time will tell if I regret the choice.

https://www.davidsilverspares.co.uk/CB500K1-FOUR-1972/part_370618/

[beardylondon]

Ah ok, no drama

[beardylondon]

I asked DS about the after market ones and they said:

“There is no manufacturing information and they are a white box product. The supplier we have for these is in Taiwan.

The centres were roughly 101mm apart which appears to be the same as the OEM type we have. “

[Oddjob]

So DS are buying stuff which they don't know the specs for or even if they are suitable for the purpose intended. I think they're just to lazy to look up the specs myself, I'd like to say nobodies that stupid but we all know it happens.

[beardylondon]

I fired back and said I’m surprised, DS said they have been selling these for 10 years!

[Laverdaroo]

I'd get them somewhere else if I was you. If they have no spec how do you know?

Plenty of other places.......

[Laverda Dave]

I used a pair with the brand name DI for my 400/4. Although they were as sold as within spec I checked them anyway and they were fine. The downside was they were 10mm shorter than the original so I had to make up a suitable bracket to fit them. They worked fine. Unfortunately I cannot remember the supplier.

[beardylondon]

I’ve been a bit busy and not got around to replacing the coils yet.

I think I’m going to go for these eBay ones.

Excuse my ignorance, but I presume it is relevantly easy to for new spark plug caps on the ends?

I fitted these (Hedler) as they are probably a temporary measure until I restore my originals.
They are Primary  5.11 Ohms - S 17.55 Ohms  made by Hedler the spec is on Hedlers website p/n 540612H
I did mot use the screws shown in the picture mounted them in the original saddle at each end.
I switched the wiring so the poitive marked terminal was on the ignition feed side.
At £29.95 each did not break the bank.(inc post)
Just made a chain link type bracket for the bottom mount as they are 90mm not 100mm centres. Might need more work if you wanted to fit them facing backwards.

.
https://www.ebay.co.uk/itm/151925589049

I think DS would tell you the brand if you asked them.