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Author Topic: Spark plugs etc  (Read 5309 times)

Offline Matt_Harrington

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Spark plugs etc
« on: May 05, 2023, 06:30:55 PM »
I was wondering what the effect was of running resistor spark plugs (DR8ESL) AND resistor caps. With assistance from Roo (and a new set of recently refurbed carbs) I find the bike now runs pretty well with resistor caps and plugs (Dyna ignition). Will it be OK or should i revert to no resistor plugs. It appears (to me) the DS only seem to spuuply the DR8ESL and resistor plugs..... ???
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Matt
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Offline Oddjob

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Re: Spark plugs etc
« Reply #1 on: May 05, 2023, 09:26:25 PM »
Why are you buying from DS anyway?

I'd use D7EA myself or go for ND plugs, no chance of buying a fake with ND plugs.
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Offline Matt_Harrington

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Re: Spark plugs etc
« Reply #2 on: May 05, 2023, 09:36:45 PM »
I'm not buying from them. I just use it as an example.
Any thoughts?

Sent from my SM-A032F using Tapatalk

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Matt
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CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
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Offline McCabe-Thiele (Ted)

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Re: Spark plugs etc
« Reply #3 on: May 06, 2023, 10:05:29 AM »
My 400 runs on Dyna coils & ignition I have resistor caps & leads with spark to spare. Engine starts with kick start instantly.
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Offline Matt_Harrington

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Re: Spark plugs etc
« Reply #4 on: May 06, 2023, 10:08:19 AM »
Thanks Ted! will leave mine as is then.
A few little jobs left and she'll be ready for the summer!
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Matt
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CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline Johnny4428

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Re: Spark plugs etc
« Reply #5 on: May 06, 2023, 11:55:57 AM »
On the subject of plugs, just had another failed NGK plug! This time on the Matchless. Bummer when you only have one cylinder.😡 Of course you’ve got to check everything else before you change the plug.🥵
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Offline McCabe-Thiele (Ted)

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Re: Spark plugs etc
« Reply #6 on: May 06, 2023, 12:21:47 PM »
As there probably not worth ever faking try Champion. lol
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Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Johnny4428

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Re: Spark plugs etc
« Reply #7 on: May 06, 2023, 01:34:13 PM »
Unfortunately put another NGK in meantime, all that is available here. They still make champions?
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1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1
1978 Honda CB550K3
1999 ST1100 Pan European 50th Anniversary.
1975,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline McCabe-Thiele (Ted)

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Re: Spark plugs etc
« Reply #8 on: May 06, 2023, 02:29:03 PM »
Yep Halfords still  sell em. Probably made in China.

The Green Spark Plug Co sell them
« Last Edit: May 06, 2023, 02:32:30 PM by McCabe-Thiele (Ted) »
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Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Laverda Dave

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Re: Spark plugs etc
« Reply #9 on: May 06, 2023, 09:09:27 PM »
Quote from: Oddjob on May 05, 2023, 09:26:25 PM
Why are you buying from DS anyway?

I'd use D7EA myself or go for ND plugs, no chance of buying a fake with ND plugs.

Where do you get your ND plugs from Ken, I've never been able to find them?
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Offline Oddjob

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Re: Spark plugs etc
« Reply #10 on: May 06, 2023, 09:27:47 PM »
The Green Spark Plug company Dave. I buy them by the box full.

The official one for the 500 is X22ES-U (400 is X24 IIRC) but I believe X24 may be a better plug due to todays fuels. Can't say for sure as I haven't fitted any yet until the bikes on the road, hopefully later this year or early next year.
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Offline Matt_Harrington

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Re: Spark plugs etc
« Reply #11 on: May 07, 2023, 09:05:06 AM »
Cheers Ken, the Denso one for a 400/4 is X24ESR-U - which is, as you say, supplied by Green Spark Plug.

This was an interesting site I came across: https://www.sparkplug-crossreference.com/convert/NGK_PN/DR8ES-L
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Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline Johnny4428

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Re: Spark plugs etc
« Reply #12 on: May 07, 2023, 10:08:37 AM »
Hi Matt, you probably know but that is resistor plugs as well.
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1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1
1978 Honda CB550K3
1999 ST1100 Pan European 50th Anniversary.
1975,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline Matt_Harrington

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Re: Spark plugs etc
« Reply #13 on: May 07, 2023, 10:55:22 AM »
Quote from: Johnny4428 on May 07, 2023, 10:08:37 AM
Hi Matt, you probably know but that is resistor plugs as well.
Yes, but as I have a massive spark with either plug, I'm not unduly concerned. (It's also the one listed in my parts book and incidentally, all the plug caps are listed as 'noise suppressor' ones - so I assume they are also resistor ones ?!) Hey ho!
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Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400
BMW F800GT

Offline Oddjob

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Re: Spark plugs etc
« Reply #14 on: May 07, 2023, 04:15:29 PM »
They list resistor plugs in the parts book because the original plug caps weren't resisted. Fit resistor caps and you should really drop the resistor plugs.

It's why the OE caps had metal shrouds around them, this was to stop interference with old 425/625 lines on the TV screen.
« Last Edit: May 08, 2023, 10:39:19 PM by Oddjob »
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