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8.1K views 21 replies 7 participants last post by  vaporlock  
#1 ·
Good afternoon everyone,

Quick question, Does anyone have info on the Denso Cop coil (ignition coil to spark plug) numbers?

I have used the ignition coil Denso number 129700-3990 (TT600 and some other Triumph ) in my '93 triumph trident instead of the conventional ignition coil-cable-connector combination.
I am in the process of building a "new" bike from my parts stock and would like to use this solution here as well. However, This Denso version 3990 is getting rare and expensive.

The Denso 129700-xxxx is available in many versions but the last 4 numbers change. The 129700-4400, 3630, 3881, 4180 etc. are easy to find and therefore much cheaper. I wonder what the last 4 numbers represent. Some of these will not work because of their length but some (like the 4510 ) should fit

Most of these variations have the same primary resistance as the 129700-3990 1.3-1.5 ohms.
Does anyone know the meaning of the last 4 numbers of the Denso coils ? Or does anyone have a spec list? I can't find much on the net.

Has anyone used a COP ignition coil other than the -3990 version successfully ?

I know Paul makes an awesome kit but i need to go the second hand route on this project.

Thanks in advance, Best regards

Leon
 
#2 ·
My understanding of the setup, as long as the resistance value is close, you’re good. Maybe it’s a different boot for the different numbers or different connector locks, could be as simple as that?
 
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#7 ·
hey Greg, yes, the 129700-3990 version is proven. I have a set running in the trident but they are getting hard to find and expensive. I am looking for more info on the possible significance of the last 4 numbers of the 129700-XXXX type coils. I know some have different lenghts and on a rare occasion the primary resistance is difference (like the 129700-4000 which seems to have 4,7ohm primary)
strange enough there is no info or specs available on these different coils
 
#10 · (Edited)
Update:
i bought a set of 129700-4150 coils. they are the same lenght as the 3990. and should have the same primary resistance.
the 5020 is given as an equivalent to the 3990 but it is 2cm longer and will be tough to get onto the middle plug.
Still need to measure the primary and secondary resistance with a bit more precision (not sure if i have the eqiupment for it.
 
K
#11 ·
Good morning,
(I am French and use Google translate so.. 😁 )

I have the same problem on my Speed Four, my coils 129700-3990 are damaged and no longer hold the spark plug properly

Can you tell me if your 129700-4150 coils worked well?
Because the 3990 are indeed rare and expensive!

Thanks ✌✌
 
#14 · (Edited)
Salut Keunard,

Nous n'avons pas de problème avec les langues étrangères ici :)
If one day you find google translate is not good enough, I use Deeple which is a big step up.

To your question, I am currently running my sprint on 4510 coils and have ridden about 4000km so far without a problem. I have some 4400 here as well but have not tested them yet.
As far as i can tell, the primary resistance needs to be 1,3-1,5 ohm- secondary resistance 10-15 Kohm.
there are quite a few coils with these specs but No COP coil specs are available from the manufacturers.
All info below is collected from the net. Often the coils will have different dimensions.

Since the T300 triples have restricted space over the middle sparkplug the max length coil we can use is 12.8cm.
i do not know if the speed four has more space, you could get away with a longer coil. here is the info i have so far:

Green has been tested and works (the usual disclaimers apply, try at your own risk:).
Orange has been reported to work but i have no experience with them.
Red will not work
uncolored insufficient data found.

Again, manufacturer specification are impossible to find. when sending Denso a request for info, No answer.

129700-3630, 1.3 ohms, secondary 11.5 Kohm from ZX9 or GSXR60012.8 cm
129700-3881, 1.3ohms, 11 Kohm F4i, CBR600, CBR900, CBR929 or CBR95414.2 cm
129700-3960 J0396, 0.8-1.2 / 8-15Kohm, from SV1000?
129700-3990 , 1.3 ohm triumph TT60012.8 cm
129700-4000 J0400, 4.7 / 17.4 Kohm?
129700-4400 J0440, 1.5 ohms, 10-15 Kohm secondary GSXR600, 750 or 100012.8 cm
129700-4150, 1.3 ohms, GSXR750 or 1000, or Versys14.2 cm
129700-4180, ?? ohms, KLE, ER or ZR?
129700-4420 J0440, 1.0-1.6 / 10-16.5 Kohms CBR600?
129700-4201, ?? ohms, ST4??
129700-4510, 1.5 ohms, CBR600RR, Versys, ER, ZX or ZR 2007-201212.8 cm
129700-4571, ?? ohms, KTM RC8?
129700-4580, 1.5 ohms, 10-15kohm EX650, KLE, ZX, ZR or Versys?
129700-4740 0.8-0.1 ohm?
129700-4800, 0.8-1.1 ohms primary , 13K secondary XV160014.0 cm
129700-4840, 1.6 ohms, 13 Kohm CBR1000RR14.2 cm
129700-5020 JO50214.2 cm
129700-5150 J0515 CBR1000RR12.8 cm
129700-5430 1.1-1.5 ohm 11-15 Kohm Kawa Z300 ER6 ZR900?
129700-5350, 1.3 ohms 11 Kohm Kawa ER6 (21171-5000, 21171-1265, 21171-1286)?
Note, variations in resistances quoted by different people may be due to meter or product variances.
 
K
#15 ·
Thank you so much for your superbly comprehensive reply! :eek:

I've ordered 3990s so I shouldn't have any problems but it's interesting to know the other possibilities, in the event of a breakdown or to help someone else.

When I get mine I'll measure the maximum possible length on the Speed Four if that helps.

Thanks again ✌
 
D
#16 ·
Here's a readily available and cheap option for the sealing the top of the 3990 coils. 3/4" electrical grommets are perfectly sized for the coil diameter and fit snugly in the cam cover. As "belt-and-suspenders" I applied dielectric grease to everything. Also used Tesa tape to wrap the pigtails. Looks factory and provides better abrasion protection and long term adhesion than conventional electrical tape.


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