Author Topic: Number 3 spark plug hole  (Read 400 times)

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Offline frenche

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Number 3 spark plug hole
« on: October 02, 2017, 09:28:24 pm »
 >:(
Number 3 spark plug hole is buggered. Don't know how much longer it will last. Looking for suggestions for patches (if needed) and permanent fixes.

Thanks for your help,
frenche

Offline DC Concours

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Re: Number 3 spark plug hole
« Reply #1 on: October 02, 2017, 11:08:54 pm »
How is it buggered?

Offline WillyP

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Re: Number 3 spark plug hole
« Reply #2 on: October 03, 2017, 12:00:43 am »
As far as I know you only have two choices if the threads are stripped out... replace the head or Helicoil.
Smart people look like crazy people to stupid people.
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Offline frenche

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Re: Number 3 spark plug hole
« Reply #3 on: October 03, 2017, 01:25:24 am »
Yes, that's right, DC Concours. About to strip.

Offline m in sc

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Re: Number 3 spark plug hole
« Reply #4 on: October 03, 2017, 11:59:00 am »

Offline DC Concours

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Re: Number 3 spark plug hole
« Reply #5 on: October 03, 2017, 12:18:27 pm »
Damn. I didnt know this problem was so pervasive that there is an industry for it. How does one strip these?! I always start by hand then use a socket wrench.

Offline Jim

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Re: Number 3 spark plug hole
« Reply #6 on: October 03, 2017, 12:39:40 pm »
Removing a seized plug, damaged threads on spark plug, removing/installing into a hot head, and using the gutentight method instead of a torque wrench especially when a anti-seize compound is applied will damage threads.  I've read you should reduce the torque value by 20 - 25% when using anti-seize.  If you use a lower value on the plugs, be sure and verify it is enough to compress the metal gasket.
« Last Edit: October 03, 2017, 02:29:43 pm by Jim »

Offline Bud

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Re: Number 3 spark plug hole
« Reply #7 on: October 03, 2017, 12:42:35 pm »
As MOB says, not everyone should be working on motorcycles, or sometimes anything mechanical.  Everyone has their strengths and weaknesses.  Working on mechanical things requires a sensitivity to how something feels.  If you have that ability to feel when something is wrong, you'll make fewer mistakes.  My opinion is that the ability to feel when a bolt is cross threaded or when you better stop tightening a bolt, comes from making mistakes in the past and being able to learn from them.   I'm guessing that the previous owner was one of the many with little mechanical experience.  BTDT just not on a spark plug hole.  Humans make mistakes!

Offline kkja13

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Re: Number 3 spark plug hole
« Reply #8 on: October 03, 2017, 10:28:34 pm »
Below is what I used to clean and freshen up the threads on one of my plugs.  It was tight coming all the way out and wouldn't hand thread the new plug back in.  After using the tool below all things were good in the world again, well at least on my #4 spark plug hole anyway. :)

Powerbuilt 641148 12mm Back-Tap Thread Repair Tool
https://www.amazon.com/gp/product/B001SOHXLQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Here's my original post and responses.
http://forum.cog-online.org/concours-c10-zg1000-general-chat-and-tech/corrosion-in-number-four-spark-plug-hole/msg596863/#msg596863

Maybe this will help you too.

2004 C10
2003 Suzuki SV650s
2000 Kawasaki Eliminator 125 (75mpg!)
1993 Suzuki DR350; 1984 Honda XR200R (RFVC); 1985 Yamaha PW80; 1975 Yamaha DT175;
1974 Honda ST90; 1973 Honda Z50 (first bike, still runs)

Offline frenche

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Re: Number 3 spark plug hole
« Reply #9 on: October 12, 2017, 04:19:14 pm »
Thanks, guys.
This has been very helpful!
frenche