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Damaged threads to spark....

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Damaged threads to spark.... 30 May 2019 03:17 #804841

  • gordone
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Today I made a mistake to damage the threads to spark plug on cylinder 2......

The threads has not perfect since I purchased the bike.....

I overhauled the top (valve etc) last year....

What posibility do I have?

I have seen some have inserted new threads with a insert? Find a workshop who can do it?

Only posibility?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Damaged threads to spark.... 30 May 2019 03:22 #804842

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Any pics of the damaged threads??

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Damaged threads to spark.... 30 May 2019 03:33 #804843

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I found these?
www.biltema.no/verktoy/handverktoy/gjeng...uggjenger-2000016884
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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Last edit: by gordone.

Damaged threads to spark.... 30 May 2019 03:50 #804845

  • Scirocco
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That sucks. You need a Timesert insert.



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Damaged threads to spark.... 30 May 2019 04:03 #804846

  • gordone
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Yes, 2 weeks before a trip so need to todo something now :) I have spare head gasket so that is good :)

Is these a good option?
www.biltema.no/verktoy/handverktoy/gjeng...uggjenger-2000016884

Shape is the same as you have?
They is made off hard steel they say in the discription.

A gay on facebook say I need to find new spark plug to match heat «resistans» to the new loose threads since they are not the same as ALU?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Last edit: by gordone.

Damaged threads to spark.... 30 May 2019 04:17 #804847

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Stay away from this repair kit, those all in one bore and thread kits are junk. Trust me, i know what i´m talking about.
Pull the head and go to an engine repair shop.

A gay on facebook say I need to find new spark plug to match heat «resistans» to the new loose threads since they are not the same as ALU?


Sorry, this bullsh*t

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Last edit: by Scirocco.

Damaged threads to spark.... 30 May 2019 04:31 #804848

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I understand....
Then my question who pop in my head, shall I take all 4 at the same time?

I have not had problem with the others, but the bike is from 1981.

When the workshop install timesert insert, will it be good as new? So maybe good to upgrade all four and then use correct nm..,
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Damaged threads to spark.... 30 May 2019 05:15 #804850

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With the proper tools an insert can be installed with the head still on the engine, even using a Timesert. Ford had a big problem on some of their V8 engines and a LOT of engines got fixed this way. The aluminum chips can be caught with a greased tap, but if a few get into the cylinder, you can suck them out with a vacuum. Plus, a few aluminum chips won't typically hurt anything anyway. They will get burned up or passed out of the exhaust.

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Damaged threads to spark.... 30 May 2019 06:07 #804854

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Thank you.

I think I shall be able to pull these of my self?

Maybe the set cost the same amount as got it repared...

The time insert itself, what materiell shall it be?
Not steel since the top is ALU?

I will call the shop tomorrow and ask If I can pay to borrow a time insert set for a day...
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Damaged threads to spark.... 30 May 2019 06:22 #804856

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These shall be quality kit:
nettbutikk.wuerth.no/innredning-og-lager...gjenge-rep-sortiment

Last thing now, is to use correct metal?
Alu?
Steel?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Damaged threads to spark.... 30 May 2019 06:54 #804860

  • SWest
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Spark plugs are steel so if anything the incerts will be better.
Steve
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Damaged threads to spark.... 30 May 2019 07:14 #804862

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From reading it looks they are steel with a layer of copper.

When I do it, I think it smart to take all 4?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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