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Author Topic: Mystery plug size  (Read 2782 times)

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Offline Raul CB750K1

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Mystery plug size
« on: October 03, 2005, 06:16:05 AM »
I have to remove my CB750 plugs. I've always done it with the plug wrench I have in my modern Suzuki GZ250 toolkit, but it is in the shop -because of a leaking gas tank I'm trying to get replaced by Suzuki even when the bike is 4 years old-.

Well, I had a 16 mm plug socket that didn't fit. So I got the bigger (21 mm) socket and it is way too big. People in the shops tell me there are only two standard measures for spark plugs, 16 and 21 (not talking about reach but about wrench side) If so, what is the size of the CB750 spark plug? ? ? ? ?


Raul
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Offline Jonesy

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Re: Mystery plug size
« Reply #1 on: October 03, 2005, 06:31:32 AM »
They are 18mm. Plugs 1, 3, and 4 are OK with a regular deep-well sparkplug socket, but #2 requires either grinding a socket down to fit, or getting a plug wrench from a CB750 (or your Suzuki) toolkit.
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"Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles; it makes me take another look." -Steve McQueen

Offline Raul CB750K1

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Re: Mystery plug size
« Reply #2 on: October 03, 2005, 07:12:43 AM »
Thanks man. After posting I did a google search and found a bunch of online shops with 16, 18 and 21 mm wrenches, so I guessed 18 was the right one. I'll probably buy online, it wil be faster and cheaper that if I have to visit every auto shop. There are not many bike shops around here.


Raul
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eldar

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Re: Mystery plug size
« Reply #3 on: October 04, 2005, 11:13:50 AM »
Well I got a plug socket from sears, you probably do not have those though, and it works fine. No grinding or anything. Unless the plug socket you get has really thick walls, it should work fine and not require anything special.
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Offline 78 k550

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Re: Mystery plug size
« Reply #4 on: October 04, 2005, 11:30:40 AM »
I just got a 18mm deep socket from sears.
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Paul
Littleton, CO

76/77 CB 750F, 
75 GL1000, (AKA GL1-242 NGWClub),
76 GL1000 LTD
84 GL1200 Standard
6 Bultaco's= 42, 49, 121, 152, 167, 188

Offline jtb

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Re: Mystery plug size
« Reply #5 on: October 04, 2005, 04:01:45 PM »
Hey Raul,

I just got a socket from Sears.

John

I'll get one & send it to you if you'd like.
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1977 CB750F
1985 V65 Sabre
1986 VFR 750 (gone but missed greatly)

Offline Raul CB750K1

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Re: Mystery plug size
« Reply #6 on: October 05, 2005, 12:47:47 AM »
Hi jtb, thanks for your kind offer. I got my Suzuki back from the shop and used the spark plug wrench. I'll try to find one, but probably I will buy a whole toolkit out of eBay or something.

This has confirmed an old saying: "no matter how many tools you have, you will always need one you don't have" And I have 4 toolboxes...


Raul
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CDN Marvin

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Re: Mystery plug size
« Reply #7 on: March 24, 2006, 01:52:36 PM »
I just picked up an EMGO plug wrench that works great for $4.89 Canadian.  It looks like the same kind that comes in the tool kits, with a removable bar that slides through holes on one end.  On the back it reads:  84-04110 Long type for 12mm spark plugs.
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Offline DammitDan

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Re: Mystery plug size
« Reply #8 on: March 24, 2006, 10:20:34 PM »
I remember using a plug at one point that was NGK but much smaller than the 18mm.... Maybe it was 16mm or 14mm?

I just make it a point to order all my plugs through http://www.z1enterprises.com/

They have the smaller nut NGK plugs, and I can't find them anywhere else around town.  It makes my job (like when I'm doing a plug chop) a whole lot easier.
« Last Edit: March 24, 2006, 10:38:21 PM by DammitDan »
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Offline MRieck

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Re: Mystery plug size
« Reply #9 on: March 25, 2006, 05:23:35 AM »
Raul
  Be sure to use that sparkplug antiseize I sent you!
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supersport_CB400F

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Re: Mystery plug size
« Reply #10 on: March 25, 2006, 05:28:59 AM »
I also use a 12mm plug socket with the rubber insert that protects the creamic and grips the plug.
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