Spark plug threads on cylinder head

  • kzed
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Spark plug threads on cylinder head

21 May 2021 06:09 - 21 May 2021 06:47
#848795
Could someone look at this picture and let me know if this will be a huge issue when I reinstall the top end? It looks like the spark plug on  cylinder 3 burned a groove in the threads. I’m cleaning everything up. But should I try and tap a bigger thread or leave it as it is and hope for the best. I’d rather not put it back together and pull it off again. I’m in deep right now

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Last edit: 21 May 2021 06:47 by kzed. Reason: Photos

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Re: Spark plug threads on cylinder head

21 May 2021 06:27
#848797
Can't see the pics.  Only content that appers is:
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Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
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1974 Z1-A x2
1975 Z1-B x2
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Re: Spark plug threads on cylinder head

21 May 2021 06:56
#848799
Pic should show up now... thanks

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Re: Spark plug threads on cylinder head

21 May 2021 06:58
#848800
You need an insert installed.  Timesert is ideal.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
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Re: Spark plug threads on cylinder head

21 May 2021 07:00
#848801
Timesert.  Ed

www.timesert.com/
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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Re: Spark plug threads on cylinder head

21 May 2021 07:18 - 21 May 2021 07:20
#848802
Only last pic showing. I dont see how that could happen unless there is a crack from the plug hole to the valve seat. That crack is fairly common and doesn't normally cause huge issues and can be easily welded.
one thing is for sure your valve seats need attention!
[img
[img
[img
[img
[img

Z1000J2 somewhat modified!
[img

Last edit: 21 May 2021 07:20 by Warren3200gt.
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  • Street Fighter LTD
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Re: Spark plug threads on cylinder head

21 May 2021 07:50
#848805
Appears that groove is eroded deeper than a timesert will fix with out first  welding in  missing material. 
 If so  , First weld up to fill in. Then finish repair with timesert.
NOTE
Looks like the head needs a complete service 
Especially if you dont want to pull it off again for a long time 
Dave

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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Re: Spark plug threads on cylinder head

21 May 2021 07:50 - 21 May 2021 07:52
#848806
This is the valve now after a little cleaning
Last edit: 21 May 2021 07:52 by Street Fighter LTD.

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Re: Spark plug threads on cylinder head

21 May 2021 07:53
#848807
I fixed your picture to be full size .
Next time click the insert all tab
Dave

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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Re: Spark plug threads on cylinder head

21 May 2021 07:57
#848808
Thanks bro
 

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Re: Spark plug threads on cylinder head

21 May 2021 08:00 - 21 May 2021 08:02
#848809
I’m doing the ton y’all. Completely deep cleaned. I hope I don’t have to open the crack case this go round. That’s a little more time than I can’t afford right now 
 this is where I’m at today
 

 and hopefully back together by this Sunday!!!!
It’s my own bike. So I don’t mind a 16 hr day working on my personal bike. It’s fun! 
Last edit: 21 May 2021 08:02 by kzed.
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Re: Spark plug threads on cylinder head

21 May 2021 08:08
#848810
Does anyone know what size insert I need on a 79 kz650?

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