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Possible with helicoil? 12 Jan 2021 11:19 #841580

  • gordone
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I was wondering if it’s possible to install helicoil instead of using nuts, the orginal threads is broken...?

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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Possible with helicoil? 12 Jan 2021 11:32 #841582

  • Warren3200gt
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It is possible however you need to use a coil which is shorter than the metal thickness and only drill and thread sufficiently deep so as to leave a smaller and unthreaded section at the top. The reason being if you drill/mill and thread right through there will be nothing to stop the helicoil threading out the top as you screw the bolts in. Once partially out the top you won't be able to screww the helicoil back in.
I would also use thread lock on the helicoil but not on the bolts.

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Last edit: by Warren3200gt.

Possible with helicoil? 12 Jan 2021 13:53 #841585

  • Irish Yobbo
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Is there any reason you can't tap it a size larger and use a larger bolt? Helicoils are only needed if you must keep the same thread size, otherwise it's just more work and money.
1981 KZ750 LTD

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Possible with helicoil? 12 Jan 2021 15:12 #841592

  • Nessism
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I'm struggling to recognize those parts. What are we looking at?

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Possible with helicoil? 12 Jan 2021 15:12 #841593

  • krazee1
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A 5mmx.08 Timesert would be really good in that application, however not cheap.

Mike
Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1A (disassembled)
1976 KZ900B LTD (SOLD!) it's in GOOD Hands!
1978 KZ1000 LTD
1976 KZ900B LTD pile O parts!

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Possible with helicoil? 12 Jan 2021 15:16 #841594

  • Warren3200gt
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Nessism wrote: I'm struggling to recognize those parts. What are we looking at?

Float bowl screws Nessism.
The following user(s) said Thank You: Nessism

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Possible with helicoil? 12 Jan 2021 15:23 #841595

  • Mikaw
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Nessism wrote: I'm struggling to recognize those parts. What are we looking at?


Your not alone
1976 KZ 900 A4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Possible with helicoil? 12 Jan 2021 15:37 #841596

  • zed1015
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You can Helicoil or re tap to M5.

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Possible with helicoil? 12 Jan 2021 16:07 #841604

  • Nessism
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Thanks for the education...

I'd helicoil. It's pretty easy to do with a kit. We are lucky here in the US because you can buy a full kit that includes drill, tap, installation tool, tang breaking tool, and a pile of inserts for dead cheap off Amazon. I recently bought a kit and was very pleased with the quality. Installing inserts properly has a learning curve so you may want to practice on some scrap part before going at the carb bodies.

www.amazon.com/gp/product/B07HF8F5GV/ref...09_s00?ie=UTF8&psc=1

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Last edit: by Nessism.

Possible with helicoil? 12 Jan 2021 18:37 #841612

  • krazee1
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I much prefer the TimeSerts (factory approved repair BTW) over Helicoils. A properly installed TimeSert is actually better than the original aluminum threaded hole in some respects. I don't think you can say that about a Helicoil repaired hole. Just my opinion, but I repaired a lot of F-Ups at the plant in 43 years. It looks to me like the holes in the carb bodies pictured are already over 5mm, so retapping is not an option.

Mike
Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1A (disassembled)
1976 KZ900B LTD (SOLD!) it's in GOOD Hands!
1978 KZ1000 LTD
1976 KZ900B LTD pile O parts!

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Possible with helicoil? 12 Jan 2021 21:59 #841623

  • gordone
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Sorry for missing information to the picture....

Thank you all for your feedbacks !
Helicoil, time insert and increase to M5.

So maybe the best and safest alternative is to go up to M5 then, there is enough material to do it?
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.
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