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Author Topic: D8EA vs. DR8EA?  (Read 1411 times)

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Offline mr.brandon

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D8EA vs. DR8EA?
« on: February 25, 2023, 09:32:08 AM »
My local shop only carries the latter "DR8EA", is that the same as the former, D8EA only with a resistor? I want  to make sure that it will work for my 1974 cb750k  and with a multimeter still test the same with a 20k ohm (omega cymbol) @ .05? When I test my other plugs with resistors they read around 5.25. Anyone out there who knows, I would appreciate it.
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Offline Nurse Julie

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Re: D8EA vs. DR8EA?
« Reply #1 on: February 25, 2023, 10:15:34 AM »
You need D8EA if you have resisted plug caps fitted, you would use the DR8EA if you have non resisted plug caps fitted.
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #2 on: February 25, 2023, 11:26:27 AM »
How can I tell or test to see if my caps ARE the resistance type or the ohm rating?
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #3 on: February 25, 2023, 11:35:07 AM »
Just found out that my sparkplug wire has 800-1000 ohm resistance per ft. (18in.-2ft. Per plug) and no resistance  with the caps. Should  I then, be getting the d8ea and not the resistance type?
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Offline Tracksnblades1

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Re: D8EA vs. DR8EA?
« Reply #4 on: February 25, 2023, 12:11:31 PM »
No.

Just like nurse Julie says…

NGK Resistor caps. This site has service manuals..
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Offline bryanj

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Re: D8EA vs. DR8EA?
« Reply #5 on: February 25, 2023, 01:28:15 PM »
Honda leads are part of coil and should only show secondary coil resistance
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #6 on: February 25, 2023, 01:38:25 PM »
I apologize, I'm not a smart man... if I were to run my wires, 800-1000 ohm per foot at 18 inches and 0 resistance caps with the D8EA plugs what would/could be the affect? Question 2: if that is absolutely the wrong thing to do (it's what I have been doing)  then, I should keep my wires, get the ngk "resistor" caps and use the (no-resistor type) ngk D8ES? Again, I apologize... electricity is certainly not my strongest point
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Offline robvangulik

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Re: D8EA vs. DR8EA?
« Reply #7 on: February 25, 2023, 03:36:46 PM »
If you are running different wires/leads, are you using another type of coils too? As mentioned above, the original Honda coils have fixed leads that can't be separately measured...
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Offline Tracksnblades1

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Re: D8EA vs. DR8EA?
« Reply #8 on: February 25, 2023, 04:15:47 PM »
Quote from: mr.brandon on February 25, 2023, 01:38:25 PM
I apologize, I'm not a smart man... if I were to run my wires, 800-1000 ohm per foot at 18 inches and 0 resistance caps with the D8EA plugs what would/could be the affect? Question 2: if that is absolutely the wrong thing to do (it's what I have been doing)  then, I should keep my wires, get the ngk "resistor" caps and use the (no-resistor type) ngk D8ES? Again, I apologize... electricity is certainly not my strongest point

Yes you are…
Post a picture of your coils..
Bryan, NJ, and Rob are pointing you in the right direction.
We need to see what coils are on your bike..
Sound like you have automotive graphite type wire in stead of the solid core Honda wire..
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #9 on: February 25, 2023, 04:39:03 PM »
I'm not sure how to post pics on this site but the lines ATE automotive type, braided, suppression from ton's, 8mm. The coil well, I know some Yamaha run them, they are 2 line and are separate from the wires. The #'s on them are "Kp02". In regards to the previous... when testing, do you need the ignition on and can all 3 items be hooked up ie, wire, boot, plug, test at the end of plug and get an accurate measure of all the resistance using a multimeter in omega (ohm) @ 20k?
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #10 on: February 25, 2023, 04:40:08 PM »
Also looking for the '74 cb750k spec for the sought after resistance range at the end of the assembly
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Offline Tracksnblades1

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Re: D8EA vs. DR8EA?
« Reply #11 on: February 25, 2023, 04:48:38 PM »
Look here…
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #12 on: February 25, 2023, 06:05:04 PM »
Manuals and tech? Ok thank you
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #13 on: February 25, 2023, 06:29:15 PM »
Did have, at least, I sure couldn't find ANY answers to those questions at all. #1: how really, do I measure the resistance, do I measure every item. By itself, wire then cap then plug (and do I double that because the other wire attached to that coil is in series)? Or, can I (somehow measure at the plug end when the 3 are all connected? Does the ignition need to be on when testing? To measure,  do I put the multimeter on (20k in the ohm (omega) part and put the black lead on the cra kcase to ground or is it grou ded on the other side of the item (like testing the sparkplug) and what is the spec range for ohms for the 1974 cb750k 's? A whole-lotta question... I am extremely lost and really need to be pointed in the correct direction by a person who really knows and has the patience to walk me through it. As I said, my coils "KP02" are 5 or 3 ohm (I will check and make sure. My wire (supression) is 800-1000 ohms per foot but also gradually breakdown,  I just don't know how to test them. Caps are rubber w/ 0 resistance (don't know how to test those either) and then my plugs, I got the d8ea kind and they are .05hope someone out there has the answers and patience.. thanks all for the replies.
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Offline bryanj

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Re: D8EA vs. DR8EA?
« Reply #14 on: February 26, 2023, 01:04:21 AM »
Unfortunately nobody can answer your question because you do not have Honda parts fitted so manuals are of no use and without knowing exactly what the parts are no answers are available, generic numbers moulded in are no use.
Personaly i would never use carbon track leads on a Honda sohc
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Offline Nurse Julie

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Re: D8EA vs. DR8EA?
« Reply #15 on: February 26, 2023, 01:28:44 AM »
This set up you have Mr Brandon sounds soooooo complicated. It's simple really, you need a pair of 5ohm coils, with standard integral built in HT leads with resisted NGK spark plug caps and D8EA non resisted spark plugs. So basically, you need the original Honda CB SOHC/4 set up.
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Offline Deltarider

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Re: D8EA vs. DR8EA?
« Reply #16 on: February 26, 2023, 02:28:41 AM »
Graphite core HT wires are a no no for our bikes. Quite a few CB Four owners have experienced issues with the Resistor type sparkplugs. So stick to the original design: standard plugs and resistor plugcaps.
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Offline C317414

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Re: D8EA vs. DR8EA?
« Reply #17 on: February 26, 2023, 05:58:30 AM »
The TEC KP02 coils on your bike are used on Kawasakis and are supposed to have a resistance of just under 3 Ohm.  They also have removable HT leads.

As others have mentioned, your bike should have 5 Ohm coils with integral leads, resistor plug caps, and non-resistor plugs.
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Offline Tim2005

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Re: D8EA vs. DR8EA?
« Reply #18 on: February 26, 2023, 12:04:51 PM »
Quote from: mr.brandon on February 25, 2023, 04:39:03 PM
I'm not sure how to post pics on this site but the lines ATE automotive type, braided, suppression from ton's, 8mm. The coil well, I know some Yamaha run them, they are 2 line and are separate from the wires. The #'s on them are "Kp02". In regards to the previous... when testing, do you need the ignition on and can all 3 items be hooked up ie, wire, boot, plug, test at the end of plug and get an accurate measure of all the resistance using a multimeter in omega (ohm) @ 20k?
Have you got the original points or electronic ignition? Just wondering.

Anyway, you don't need the ignition on when measuring resistances, indeed that would probably not do your meter a lot of good, and separately or connected together the items should all total up the same resistance.

I've not heard of a problem with graphite core leads, but you could easily fit copper core leads instead if there's an issue.

As for having your resistance in the leads & plugs instead of the caps, it'd be worth reaching out to TwoTired on here for his electrical expertise. 

Finally, I've been running 3 ohm coils for many many years without issues at all, in my case with copper cored leads, NGK resistor caps and D8EAs .
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #19 on: March 01, 2023, 06:41:16 PM »
I'm pretty sure I blew a coil or maybe 2... I was syncing my carbs and had it running without a fan for maybe 10 min. Got them synced but, when I came back tovre-start and make sure the sync stayed, it wouldn't start back up. I don't have oem coils. They are "kp02" 5 ohm which,  I suppose that as long as there 5 ohm, that'll work.  My question is, if I take them off or rather, disconnect all lines and power, put my ohmeter on the ohm setting (the omega sign) and put it on the lowest setting which I think is 20 or 20k, I should get .05 ohms if it is a good coil? Because,  I bought new used coils and they are both testing .01. I'm really not certain how to test correctly or what I should be getting as a good reading for an operational coil.
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Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #20 on: March 01, 2023, 06:47:02 PM »
I apologize, that last message was supposed to be a private letter but, anyone is free to answer, I ALWAYS will welcome a helping hand, and be thankful as well!
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Offline newday777

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Re: D8EA vs. DR8EA?
« Reply #21 on: March 01, 2023, 07:22:10 PM »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline mr.brandon

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Re: D8EA vs. DR8EA?
« Reply #22 on: March 02, 2023, 05:07:11 AM »
Thank you Stu, that was a perfect explanation on how to test the coil. I greatly appreciate it.
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Offline newday777

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Re: D8EA vs. DR8EA?
« Reply #23 on: March 02, 2023, 06:52:44 AM »
Quote from: mr.brandon on March 02, 2023, 05:07:11 AM
Thank you Stu, that was a perfect explanation on how to test the coil. I greatly appreciate it.

 8)
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Deltarider

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Re: D8EA vs. DR8EA?
« Reply #24 on: March 02, 2023, 07:22:50 AM »
Quote from: newday777 on March 01, 2023, 07:22:10 PM
How to test the coils


Sorry to say that's not the right video for the coils on our bikes.
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