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Author Topic: Spark plugs??  (Read 10126 times)

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Jim Shea

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Spark plugs??
« on: September 25, 2005, 03:02:29 AM »
I have tried to extract my spark plugs this morning and it seems that the 2 plug spanners that I have are too big for the spark plugs?? Is there a specific type of plug spanner that i need? Also, the plugs do not appear to have any number on them, what type of plug do I need?
Thanks,
Jim.
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Jim Shea

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Re: Spark plugs??
« Reply #1 on: September 25, 2005, 03:25:25 AM »
Spent an hour searching for NGK info on the site and found that....
I need a 18mm plug spanner and popular opinion says that NGK D8EAs are the plug to use?? Any comments??
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Offline GeoffT

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Re: Spark plugs??
« Reply #2 on: September 25, 2005, 03:40:04 AM »
Need a spark plug spanner. Does it have to be a special particularly for the inside two?
Will an ordinary 18 mil from any auto shop do the job?
« Last Edit: September 25, 2005, 03:42:10 AM by GeoffT »
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Offline GeoffT

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Re: Spark plugs??
« Reply #3 on: September 25, 2005, 03:54:06 AM »
Cool! Never seen one for a socket set. Day off tomorrow so a trip to the tool shop is on the cards. I only have a couple of the 'T' type handle ones - neither are 18 mil. Had the bike a year now so better check the plugs soon. They were new in when i got it.
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Jim Shea

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Re: Spark plugs??
« Reply #4 on: September 25, 2005, 04:12:05 AM »
David Silver shows a NGK D8ESL plug for a F1, (I have a 76 F1).... I saw in another thread, to use the NGK D8EA, is there a difference??
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Jim Shea

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Re: Spark plugs??
« Reply #5 on: September 25, 2005, 04:21:23 AM »
Maybe I should trust what the David Silver web site says to use??
On checking in the Greenspun archives, it appears that D8EA and D8ESL are the same plug, just updated numbering scheme!!
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Offline mcpuffett

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Re: Spark plugs??
« Reply #6 on: September 25, 2005, 04:21:44 AM »
hi jim , i also have a 76' f1 and i use DR8ESL £ 2 quid each from dave silvers  ;)  mick.
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Honda CB750 KO 1970,   Honda VTX 1300 2006, Lancaster England.

Jim Shea

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Re: Spark plugs??
« Reply #7 on: September 25, 2005, 04:25:05 AM »
Cheers Mick,
It seems the more you learn the less you know!!
I just read another thread saying "The reference to all CB 750 spark plugs isnt correct according to www.ngkcat.co.uk 750's K1 thru K6 = DR8ES-L K7 = D8EA Not sure about K8 Technical told me the centre electrode is thicker in D8EA and has a resistor."
I also read that the 750 already has a resistor and does not need it in the plug??
Bloody hell, it's a mine field!!!!
Jim.
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Jim Shea

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Re: Spark plugs??
« Reply #8 on: September 25, 2005, 04:26:44 AM »
Mick,
Nice bike.... What sort of pipe are you running? I have a Motad but yours looks shorter, do you like it? Does the bike perform OK?
Jim.
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Offline GeoffT

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Re: Spark plugs??
« Reply #9 on: September 25, 2005, 04:28:26 AM »
Quote from: supersport_CB400F on September 25, 2005, 03:55:13 AM
it's stamped 12mm plug....... 18mm  ??? but I have a 400 and use those plugs 8)

Know what I'm looking for now. I'll check the 12mm........18mm thing in the shop.
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Offline mcpuffett

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Re: Spark plugs??
« Reply #10 on: September 25, 2005, 04:34:25 AM »
hi jim, i have been using DR8ESL'S for well over 10 years with no issues ;) the exhaust is a home made affair the one in my picture is a cut down motad ,i also run my bike with s+b filters and sounds good and runs great 8)  mick.
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Honda CB750 KO 1970,   Honda VTX 1300 2006, Lancaster England.

Jim Shea

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Re: Spark plugs??
« Reply #11 on: September 25, 2005, 04:36:14 AM »
Glad you know, I am still confused!! Is it a 12mm or an 18mm???? or is a 12mm plug spanner, the same as a 18mm socket??
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Jim Shea

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Re: Spark plugs??
« Reply #12 on: September 25, 2005, 04:38:16 AM »
Mick,
Are the S&B filters from David Silver? or are they are a better filter in your opinion?
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Offline mcpuffett

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Re: Spark plugs??
« Reply #13 on: September 25, 2005, 04:50:49 AM »
hi jim , same again really i have been using these for over 10 years or more with no issues ,get's rid of standard air filter box, they are easy to clean, better access to carbs had to jet up on main jet and with exhaust i usually run makes bike breathe a lot better in my opinion ;)  mick.
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Honda CB750 KO 1970,   Honda VTX 1300 2006, Lancaster England.

Offline Kevin D

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Re: Spark plugs??
« Reply #14 on: September 25, 2005, 05:32:40 AM »
Guys,
 for threaded items the mm size generally refers to the thread size, and not to the hex head size.
 Sockets are generally referred to by the hex size - but not this one.

 I happen to like the spark plug socket supplied in the factory tool kit. It's thin walled with a long reach and knurling on the end to make it easy for finger tightening.

 My K1 has resistor plug caps (5000 ohms), and so it doesn't need resistor plugs. It came with D8ES, and I have also used D8ES-L, D8EA. It presently has DR8ES-L (resistor plug) and it doesn't seem to mind at all having an extra resistor, but I will be changing them back to the non-resistor type.

 My biggest problem is with plugs is that I have to ride the bike hard enough to keep them from getting fouled. Too much putt-putting around town is not good for this bike. I reduced the main jets one size to 115 this year and it seems to be better on that account. I used "Gumout" fuel additive/cleaner (once upon a time, never again) and the plugs were permanently fouled and had to be discarded.
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71 CB750 K1
104,000 miles
Original Owner
———past———
70 SL100/125/150
70 Candy BlueGreen CB 750 K0
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Former Honda parts kid/counter kid/do all
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Whether you think you can or think you can’t, you’re right
Genius is 99% perspiration, 1% inspiration

Offline bryanj

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Re: Spark plugs??
« Reply #15 on: September 25, 2005, 05:45:10 AM »
Hi Jim, I have a couple of original honda tool kit plug spanners new that i broought in from USA give me a ring and we will talk price if you want. Bryan
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Jim Shea

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Re: Spark plugs??
« Reply #16 on: September 25, 2005, 06:16:24 AM »
Bryan,
What time should I call you tomorrow?

Thanks guys for the info...
Jim.
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Offline Bob Wessner

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Re: Spark plugs??
« Reply #17 on: September 25, 2005, 06:19:06 AM »
Quote
Too much putt-putting around town is not good for this bike. I reduced the main jets one size to 115 this year and it seems to be better on that account.

Wouldn't this be more of a low speed jet/idle mixture issue? Fiddling with the idle mixture on mine cured the same issues.
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Offline Gordon

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Re: Spark plugs??
« Reply #18 on: September 25, 2005, 06:26:16 AM »
Oh NO!  You woke up the carb beast!  ;)
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Offline Bob Wessner

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Re: Spark plugs??
« Reply #19 on: September 25, 2005, 08:02:58 AM »
Quote
Oh NO!  You woke up the carb beast! 

Growl!!....followed by a whimper.  :D ;D
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Offline techy5025

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Re: Spark plugs??
« Reply #20 on: September 25, 2005, 10:06:46 AM »
The socket that fits all my plugs is an 18 mm "thin wall"
long reach socket.  The clearance is reallly tight on the
750 between number 2 and 3 and the surrounding fins.

At one time I resorted to using the one that came in the
Honda tool kit.  Back in the 70's, I read a writeup somewhere
that described grinding down a socket so that it would fit
over the plugs and clear the fins.  I think that problem has
gone away with the thin wall jobbies.

And heed the advice to hand thread first...it is really easy to
cross thread....and to drop the plug and get it wedged in between
the fins.... ::)

Jim

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........
1969 750 K0 (Reborn)
1969 Sandcast 750 K0 (Reborn)
2003 CBR600F4I
........

Offline techy5025

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Re: Spark plugs??
« Reply #21 on: September 25, 2005, 12:14:45 PM »
Wow ..  I learn something everyday.  A plug socket carries a different
marking then a regular socket for the same hex size.  Sounds like a good
addition to my toolbox... ;D

Jim
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........
1969 750 K0 (Reborn)
1969 Sandcast 750 K0 (Reborn)
2003 CBR600F4I
........

eldar

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Re: Spark plugs??
« Reply #22 on: September 25, 2005, 07:55:50 PM »
In the USA, the 750 uses a D8EA plug. Non-resistor.  These plugs use an 18 Millimeter socket which I got from sears. All plug sockets I have seen have a rubber insert. I have never worried about thin/thick walled sockets since mine socket has always fit fine. I suppose though in the UK and other areas, they use goofy measurements.

Also if you engine is tuned properly, ANY speed is fine for your bike.
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Offline GeoffT

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Re: Spark plugs??
« Reply #23 on: September 28, 2005, 06:57:29 AM »
Finally got round to picking up a spark plug socket today. It is marked 12mm right enough i took it outside the shop to test fit it first on no.s 1 + 2. Fits perfect. Used a universal joint conector thingy for extra reach. Got all the plugs out and they look fine. Only thing is that they are NGK D7ES. (I never wrote the number down before replacing the plugs so the letters might be off but the number was 7). Does that sound OK for a F1 550 as I see that many of you were mentioning an 8es or similar. I have no idea what the numbers mean in any case.
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Jim Shea

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Re: Spark plugs??
« Reply #24 on: September 28, 2005, 07:35:32 AM »
Geff,
Good to hear that another newbie managed to change the plugs OK, I will be attempting it this weekend!
From the David Silver site; the DR7ES is for a 550 and the 8 is used on a 750...
Cheers,
Jim.
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