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Author Topic: spark plug thread size??  (Read 3183 times)

Offline Noho Drewster

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spark plug thread size??
« on: May 31, 2011, 06:03:17 AM »
Bought a $20 compression tester from Harbor Freight and the 12 mm adapter almost stripped out #4 plug.  Anyone know what the tread size is, or where I can find an adapter??
Thanks, Drew
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'94 C-10
'79 Shovelhead

Offline T Cro ®

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Re: spark plug thread size??
« Reply #1 on: May 31, 2011, 07:04:23 AM »
14 mm thread and the pitch I think is 1.25 pitch.
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Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010

Offline Noho Drewster

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Re: spark plug thread size??
« Reply #2 on: May 31, 2011, 03:03:34 PM »
OK, Thanks Tony!!
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'94 C-10
'79 Shovelhead

Offline Noho Drewster

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Re: spark plug thread size??
« Reply #3 on: June 15, 2011, 04:04:36 PM »
Just an FYI Tony,
the plugs are 12mm.
Drew
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'94 C-10
'79 Shovelhead

Offline Mettler1

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Re: spark plug thread size??
« Reply #4 on: June 15, 2011, 05:13:22 PM »
Quote from: Noho Drewster on June 15, 2011, 04:04:36 PM
Just an FYI Tony,
the plugs are 12mm.
Drew
  Funny. I thought so too but I would NEVER question Tony. He knows everything!!! :yikes: ;D ;D
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'94 Concours 112,000 miles-- 7th gear,2MM,KB fork brace,Over flowtubes,Stick coils,Tcro shifter,GPS,Torque cams,SPOOKFAK,block off plates, SS brake & clutch lines,KB risers, FENDA EXTENDA, emulators,etc

Offline T Cro ®

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Re: spark plug thread size??
« Reply #5 on: June 16, 2011, 05:42:02 AM »
Quote from: Mettler1 on June 15, 2011, 05:13:22 PM
  Funny. I thought so too but I would NEVER question Tony. He knows everything!!! :yikes: ;D ;D

NOPE .... I make mistakes too.... Funny thing is I double checked across a chart and I'm fairly sure the chart is correct so I can only blame my old eyes and being eager to post an answer. Must have crossed my B's & D's
« Last Edit: June 16, 2011, 06:31:53 AM by T Cro ® »
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Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010

Offline Dan

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Re: spark plug thread size??
« Reply #6 on: June 17, 2011, 10:41:56 AM »
Do u guys run ngks?
Since I am trying my first valve adjustment, figure I will put in new plugs as well....

Dan
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Offline gtr1000

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Re: spark plug thread size??
« Reply #7 on: June 17, 2011, 12:09:24 PM »
Quote from: Dan on June 17, 2011, 10:41:56 AM
Do u guys run ngks?
Since I am trying my first valve adjustment, figure I will put in new plugs as well....

Dan

Yep, Iridiums at the moment and before that, standard NGKs. Never rated Champion or Nippon Denso but have occasionally used Bosch.
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Paul OTP (near Windsor, GB).

06 C-10, 2009 to .....
A5 C-10, 2000 to 2009.

Offline Jet86

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Re: spark plug thread size??
« Reply #8 on: June 17, 2011, 02:50:45 PM »
Over the last few months my bike was getting harder to start and once it was running and going down the road it was good but if i turned it off to run in the store and come out 15min later it did not want to start until a big backfire out the right tailpipe, i thought it was my carb's cause i know they need cleaning but after adjusting my valves and putting in a new set of NGK D8EA this girl woke up, she now starts Immediately, there was only 2 valves outta spec so i don't think that was causing the backfire, now i know what to do when she gets hard to start or backfires.
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1986 California Connie 87k and counting
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