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This Is Going to Sound Silly...
but what size socket is needed for the spark plugs on a GL1200. I am trying to remove the spark plugs to replace the timing belts (to make the engine easier to turn). However, the socket I use on my VTX 1300 doesn't fit and the socket I use on my automobiles don't fit either.

Thanks.
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#1 04-05-2010, 08:44 PM,
I believe it's 18mm.
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#2 04-05-2010, 10:25 PM,
Umm.. 5/8" DEEP...
Scott, 1986 aspencade 2 BLUE
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#3 04-06-2010, 04:37 AM,
scott Wrote:Umm.. 5/8" DEEP...

That's what I would have thought, but a 5/8" is too big. The previous owner told me he had just replaced the plugs; I guess he used a non-standard sized spark plug.

K Bergen, I'll try an 18mm deep-walled socket.

Thanks.
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#4 04-06-2010, 07:59 AM,
sparkplug is like kb says its an 18mm/ 3/4" sparkplug,it definitely not a standard which is why normally i have to use the sparkplug tool normally frm the bike tookit

you may be able to get one spec order from an auto parts store or most bike shops should carry this
1987 Aspencade 129K
1986 SEI 93K
2014 Tri-Glide HD 17K

Hancock,MD
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#5 04-06-2010, 09:25 AM,
K Bergen Wrote:I believe it's 18mm.

That sounds correct Ken -- at least for the standard/Iridium plugs/

I recently bought a magnetic spark plug socket -- either from Harbor Freight Tools or Autozone -- which makes changing plugs nearly a pleasure (compared with the old fashioned sockets with a rubber insert). It saves having to fish for the plug in the well when it slips off the rubber insert. Once the plug is unscrewed, it sticks firmly to the magnet inside the socket.

There's a magnetic insert on the market that replaces the old rubber insert magnetic insert for $3 at eBay which maybe can do the job.
[attachment=0]

But I can't vouch for this insert -- other than to say that my pricier 18 mm magnetic spark plug socket REALLY makes changing plugs a LOT easier. :YMHUG:


Attached Files
.jpg   SparkPlug Insert.jpg (Size: 63.22 KB / Downloads: 418)
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" ... If you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas." ~ George Bernard Shaw (1856-1950)
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#6 04-06-2010, 11:03 AM,
The spark plug takes a 16mm or 5/8". 18mm is not same as a 3/4", 19mm is.
Poorboy
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#7 04-06-2010, 11:29 AM,
I've got a spark plug in one hand my callipers in the other, it's 18mm. :mrgreen:
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#8 04-06-2010, 11:36 AM,
You might should have your mic checked. 16mm=.625, 18mm=.720 :mrgreen: :mrgreen:
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#9 04-06-2010, 01:23 PM,
Poorboy Wrote:You might should have your mic checked. 16mm=.625, 18mm=.720 :mrgreen: :mrgreen:
You should have your calculator checked
16mm=0.6299" and 18mm=0.7087". :d :d

BTW: A vernier calliper doesn't go out of adjustment that far unless you really brutalize it.

Once again the spark plug socket size is 18mm. :mrgreen:
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#10 04-06-2010, 01:43 PM,
Maaaa! Come quick, they're fightin' again! :mrgreen:
[Image: Akriti2450x338.jpg]

" ... If you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas." ~ George Bernard Shaw (1856-1950)
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#11 04-06-2010, 03:01 PM,
bob NE In. Wrote:I get 18.523 mm +/- .023
For?



Quote:Now if you will excuse me....I see a couple of women fighting over a baby.
Half a nice day
Solomon
I hope the baby didn't get hurt in the kerfufle. Confusedhock:
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#12 04-06-2010, 03:10 PM,
bob NE In. Wrote:
K Bergen Wrote:
bob NE In. Wrote:I get 18.523 mm +/- .023
For?


No.....just one.
?
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#13 04-06-2010, 03:54 PM,
The plug I checked was a Champion, they are 16mm. The NGKs are 18mm. ^Smile^ Poorboy

PS, My calipers are right on the money, I must have read them wrong. :oops:
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#14 04-06-2010, 04:40 PM,
Its 18MM, i bought a long socket that fits and works perfectly.
85' GL 1200 Interstate - My Picture Thread
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#15 04-08-2010, 10:40 AM,


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