Spark plug threads on cylinder head

kzed
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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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Enjoy Life! IT HAS AN EXPIRATION DATE!

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

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A Rider looks at your odometer and tags.

1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

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kzed
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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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Nessism
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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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650ed
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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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Warren3200gt
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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!

Z1000J2 somewhat modified!

Last edit: 21 May 2021 07:20 by Warren3200gt.

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Street Fighter LTD
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TURBO, Its Better to be Blown than Injected

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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kzed
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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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Street Fighter LTD
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TURBO, Its Better to be Blown than Injected

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

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kzed
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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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kzed
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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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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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Spark plug threads on cylinder head

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