KZR's Bikes of the Month for 2024

Iridium vs oem spark plug

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06 Nov 2024 09:07 #905816 by Maxbou92
Iridium vs oem spark plug was created by Maxbou92
Hello guys, does it improve something to put BR8EIX instead of Br8es plug ?

Kz750e 1980

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06 Nov 2024 09:21 - 06 Nov 2024 09:22 #905817 by Warren3200gt
Replied by Warren3200gt on topic Iridium vs oem spark plug
Anything with an R in the title has a resistor built into the plug. If you already have a resistor in the plug cap it'll result in a crap spark whatever plug you use. 
An iridium plug isn't going going to compensate for a 40 year old engine that isn't factory fresh. 
Whatever plug is recommended by the fsm is what to fit or another manufacturers equivalent of it but definately NOT a resistor plug. 


Z1000J2 somewhat modified!

Last edit: 06 Nov 2024 09:22 by Warren3200gt.

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06 Nov 2024 13:54 #905828 by sf4t7
Replied by sf4t7 on topic Iridium vs oem spark plug
IMHO, the only thing buying iridium plugs for an older motorcycle will improve is the seller's cash flow.  I'm with Warren, use the fsm recommended plug or equivalent and avoid resistor plugs. Non-resistor NGK B8-ES are getting hard to find.  I've had good luck with Denso W24ES in my Z1.


Scotty

1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion

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06 Nov 2024 14:19 #905829 by Maxbou92
Replied by Maxbou92 on topic Iridium vs oem spark plug
How do I inow if my cap has a resistor in it ?! And yes I cannot find B8es.. thats why I use Br8es. Does the  Denso W24ES has the same température as oem ?!

Kz750e 1980

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06 Nov 2024 14:21 - 07 Nov 2024 05:24 #905830 by Nessism
Replied by Nessism on topic Iridium vs oem spark plug
I agree with the others about avoiding an additional resistive element into the system.  On some plug caps (never tried with the KZ flavor caps), the resistor can be removed, and replaced with a slug of copper.  

Regarding a resistor plug hurting spark, realize, that some bikes used resistor spark plugs for some specific markets.  Canada   As long as the ignition system is working properly, I don't think a resistor plug is a tragic mistake.

Last edit: 07 Nov 2024 05:24 by Nessism.
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06 Nov 2024 16:47 #905832 by sf4t7
Replied by sf4t7 on topic Iridium vs oem spark plug
Yes, W24ES is the equivalent to B8-ES.


Scotty

1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion
The following user(s) said Thank You: Maxbou92

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06 Nov 2024 17:50 - 06 Nov 2024 18:35 #905834 by daveo
Replied by daveo on topic Iridium vs oem spark plug
Resistor Caps; Dynatek 7mm Copper Core Wires:


Denso W27ES-U (corrected) Spark Plugs:



 

1982 KZ1100-A2

Last edit: 06 Nov 2024 18:35 by daveo.

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06 Nov 2024 18:08 #905835 by Maxbou92
Replied by Maxbou92 on topic Iridium vs oem spark plug
Why do you have resistor cap with non resistor spark plug?! I just order 8  Denso w24es-u .. you have w27es ?

Kz750e 1980
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06 Nov 2024 18:29 - 06 Nov 2024 18:33 #905836 by daveo
Replied by daveo on topic Iridium vs oem spark plug
 

W27ES-U (correct) is a step cooler plug...   
and one resistor component is recommended per cylinder.

1982 KZ1100-A2

Last edit: 06 Nov 2024 18:33 by daveo.
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06 Nov 2024 18:36 #905837 by Maxbou92
Replied by Maxbou92 on topic Iridium vs oem spark plug
You run coller plugs for what reason?

Kz750e 1980

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06 Nov 2024 19:21 - 06 Nov 2024 19:31 #905839 by daveo
Replied by daveo on topic Iridium vs oem spark plug
U-Groove strap feature:


A member suggested that one step cooler plug would provide improved combustion for my engine setup.  

The W27​​​​​ES-U straps have a well defined burn area compared with the W24ES-U shown below:

1982 KZ1100-A2

Last edit: 06 Nov 2024 19:31 by daveo.

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06 Nov 2024 20:41 #905840 by ckahleer
Replied by ckahleer on topic Iridium vs oem spark plug
NAPA sells B8-ES plugs. The new NGK p/n is 2411.
www.napaonline.com/en/p/NGK2411

94 KE100
81 CM200t
82 KZ305
85 VF1100c
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