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Author Topic: D8EA thread PITCH  (Read 4799 times)

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Offline cookindaddy

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D8EA thread PITCH
« on: September 25, 2009, 05:27:20 AM »
I want to run a tap through the spark plug holes in a 78 CB750K head I am rebuilding to clean them out. I have two 12 mm taps, but both are too coarse. One is a 12x1.75mm and the other is a 12x1.5. Can anyone tell me the correct size? Would it be 12x1.25?

Thanks
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George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

Offline Tretnine

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Re: D8EA thread PITCH
« Reply #1 on: September 25, 2009, 06:35:03 AM »
I don't know what the threading is, but I think the thread size is part of the code on the spark plug. I would search via 'the googles' and see if you can get the specifics on what the pieces of that code mean.
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Offline MCRider

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Re: D8EA thread PITCH
« Reply #2 on: September 25, 2009, 06:43:50 AM »
Quote from: cookindaddy on September 25, 2009, 05:27:20 AM
I want to run a tap through the spark plug holes in a 78 CB750K head I am rebuilding to clean them out. I have two 12 mm taps, but both are too coarse. One is a 12x1.75mm and the other is a 12x1.5. Can anyone tell me the correct size? Would it be 12x1.25?

Thanks

I thought so, but I checked with my thread gauge. It is 12 x 1.25. My Craftsman tap and Die kit doesn't have it either. Just the 1.75 and 1.50. Must have to buy it special. Shouldn't be too hard though as it is a common spark plug size.
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline cookindaddy

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Re: D8EA thread PITCH
« Reply #3 on: September 25, 2009, 06:48:56 AM »
Thank you
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George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

Offline fmctm1sw

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Re: D8EA thread PITCH
« Reply #4 on: September 25, 2009, 08:57:32 AM »
You're going to have a hell of a time finding one at your lcoal parts stores.. I tried.  Online looks to be the best shot.  Look up timeserts, etc...
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Offline paddy paul

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Re: D8EA thread PITCH
« Reply #5 on: September 25, 2009, 09:07:14 AM »
I had to get one from the snap-on guy that comes to the shop everyweek, but I don't remember what I paid, probably a small fourtune because I was to lazy to look around and find a cheaper one..
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Offline MCRider

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Re: D8EA thread PITCH
« Reply #6 on: September 25, 2009, 09:10:42 AM »
Quote from: paddy paul on September 25, 2009, 09:07:14 AM
I had to get one from the snap-on guy that comes to the shop everyweek, but I don't remember what I paid, probably a small fourtune because I was to lazy to look around and find a cheaper one..

My local ACE hardware has them for $7.50, and a quick look on Amazon.com tools has them also for $7.90.

http://www.amazon.com/12mm-1-25-Speed-Steel-Plug/dp/B0006FI8CQ/ref=sr_1_1?ie=UTF8&s=hi&qid=1253895137&sr=1-1

I just searched it "12mm x 1.25 tap"
« Last Edit: September 25, 2009, 09:13:07 AM by MCRider »
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline Alan F.

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Re: D8EA thread PITCH
« Reply #7 on: September 25, 2009, 09:36:13 AM »
I just searched Canadian Tire's site but all I could find was this Back Tap Spark Plug Thread Tool for Motorcycles at $79.99 and it doesn't specify thread or thread pitch.
http://www.canadiantire.ca/AST/browse/4/Auto/AutoTools/EngineTools/PRD~0251180P/Powerbuilt%2BBack%2BTap%2BSpark%2BPlug%2BThread%2BTool%2Bfor%2BMotorcycles.jsp
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Offline MCRider

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Re: D8EA thread PITCH
« Reply #8 on: September 25, 2009, 09:49:17 AM »
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."
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