Spark plug threads on cylinder head

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21 May 2021 06:09 - 21 May 2021 06:47 #848795 by kzed
Spark plug threads on cylinder head was created by kzed
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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  • slmjim+Z1BEBE
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21 May 2021 06:27 #848797 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic Spark plug threads on cylinder head
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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1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
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21 May 2021 06:56 #848799 by kzed
Replied by kzed on topic Spark plug threads on cylinder head
Pic should show up now... thanks

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21 May 2021 06:58 #848800 by Nessism
Replied by Nessism on topic Spark plug threads on cylinder head
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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21 May 2021 07:00 #848801 by 650ed
Replied by 650ed on topic Spark plug threads on cylinder head
Timesert.  Ed

www.timesert.com/
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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21 May 2021 07:18 - 21 May 2021 07:20 #848802 by Warren3200gt
Replied by Warren3200gt on topic Spark plug threads on cylinder head
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!
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Z1000J2 somewhat modified!
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Last edit: 21 May 2021 07:20 by Warren3200gt.
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  • Street Fighter LTD
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21 May 2021 07:50 #848805 by Street Fighter LTD
Replied by Street Fighter LTD on topic Spark plug threads on cylinder head
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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21 May 2021 07:50 - 21 May 2021 07:52 #848806 by kzed
Replied by kzed on topic Spark plug threads on cylinder head
This is the valve now after a little cleaning
Last edit: 21 May 2021 07:52 by Street Fighter LTD.

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21 May 2021 07:53 #848807 by Street Fighter LTD
Replied by Street Fighter LTD on topic Spark plug threads on cylinder head
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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21 May 2021 07:57 #848808 by kzed
Replied by kzed on topic Spark plug threads on cylinder head
Thanks bro
 

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21 May 2021 08:00 - 21 May 2021 08:02 #848809 by kzed
Replied by kzed on topic Spark plug threads on cylinder head
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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21 May 2021 08:08 #848810 by kzed
Replied by kzed on topic Spark plug threads on cylinder head
Does anyone know what size insert I need on a 79 kz650?

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