Author Topic: Corrosion in number four spark plug hole  (Read 1134 times)

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Offline kkja13

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Corrosion in number four spark plug hole
« on: May 27, 2017, 08:12:21 pm »
Doing a tune up and valve adjust today.  When I pulled the number four spark plug it was snug all the way out.  Once removed I noticed that the well is corroded.  See pictures below.  There was gritty powder in the well and it was also on the the threads of the spark plug.  I think that the spark plug threads picked up the grit on the way out.  I vacuumed both the well and the cylinder out with a small hose on my shop vac and it is clean now.

Has this happened to anyone else's bike?  I'm guessing this happens from number 4 getting rain in it while on the side stand.

Will there be any issues with the threads?
Before and after below.

2004   32k miles.
« Last Edit: May 27, 2017, 08:52:18 pm by kkja13 »
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 dboogie2288

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Re: Corrosion in number four spark plug hole
« Reply #1 on: May 28, 2017, 12:03:30 am »
Could be water seeping in due to a bad seal on the boot cap. Or, could be arcing from a loose spark plug boot. If you havent already, you might consider clipping the wire, and putting on a new boot. Or replacing the wires entirely. NGK makes new boots you can buy at your local parts store, or murph sells a kit too.
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Offline kkja13

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Re: Corrosion in number four spark plug hole
« Reply #2 on: May 28, 2017, 02:15:34 am »
I was planning to cut the wires and re-install the caps anyway.  The bike now lives in the garage so hopefully water is no longer an issue.

Hoping that the threads are still good, considering chasing the threads with a tap with grease on it.  Opinions?
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)

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Re: Corrosion in number four spark plug hole
« Reply #3 on: May 28, 2017, 03:50:45 am »
Just use some anti seize on the new plug and it should be fine . Do the turn it and turn out with it if it feels tight going in .
1987 C 10
80 Kawasaki KZ 1000 MK 2
74 Honda 750 four ss
73 Suzuki 550 triple
72 Honda 550 four

Offline kkja13

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Re: Corrosion in number four spark plug hole
« Reply #4 on: May 28, 2017, 04:43:04 am »
Good idea.  It will go in about 2 revolutions before it gets snug.
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 cmonSTART

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Re: Corrosion in number four spark plug hole
« Reply #5 on: May 28, 2017, 10:44:45 am »
If it feels restricted - I've had great luck with a set of these. 

https://www.amazon.com/KD-Back-Tap-Spark-Rethread-Tool/dp/B00T3M69P6/ref=pd_sim_263_6?_encoding=UTF8&pd_rd_i=B00T3M69P6&pd_rd_r=GX46R6MCTN73610N26A6&pd_rd_w=dscBq&pd_rd_wg=ilKxj&psc=1&refRID=GX46R6MCTN73610N26A6

They chase the threads from the inside out - just be careful you start it straight.  Also you can use a bit of grease to catch whatever gunk gets cleaned off the threads. 

Offline Bob H

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Re: Corrosion in number four spark plug hole
« Reply #6 on: May 28, 2017, 10:57:45 am »
Wow!  Great tool, I hadn't seen one before.  Thanks!
Remember, much of what you see on-line is wrong or misguided, your task is to filter that out!
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Offline Boomer

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Re: Corrosion in number four spark plug hole
« Reply #7 on: May 29, 2017, 02:04:48 pm »
Do you mean the left plug or right plug?

The left suffers when on the sidestand.
I put Blue Hylomar on the rubber cap to seal it to the rocker cover.
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Offline kkja13

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Re: Corrosion in number four spark plug hole
« Reply #8 on: May 30, 2017, 10:41:20 am »
The right side plug.  It had gotten water in there at some point in the bikes life.  I have always either covered it, at work, or garaged it at home.

I ordered a back tap thread repair tool.  It should be here tomorrow.
https://www.amazon.com/gp/product/B001SOHXLQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

My son and I are taking a weekend ride up to Mena, Arkansas on the 9th so I've got to get this thing going (no pressure). :-\
The good news is that the valves are adjusted, just needing to do:
1. replace the spark plugs
2. spark plug well o-rings
3. block off plates
4. carb sync
5. air filter

then  :motonoises:
« Last Edit: May 30, 2017, 10:48:34 am by kkja13 »
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 kkja13

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Re: Corrosion in number four spark plug hole
« Reply #9 on: June 02, 2017, 12:05:25 pm »
Update:
Good news!
The back tap worked great.  It is really nice that it can be adjusted while it is engaged in the threads.  I started off light and progressively expanded it.  I probably ran it thru there 10 times, cleaning and re-greasing every time.  The last time I was able to run it fully expanded.  The flutes caught the debris.  The threads were mostly gunked up with debris that fell in when I removed the plug.  Yes I should have blown out the spark plug wells, but the first 3 were squeaky clean so I didn't even look into the 4th hole.  DUMB!
Previously the new plug would only go in 1 or 2 turns by hands. Now I was able to turn the plug by hand all the way down to the seat.  All 4 plugs are torqued and I'm now ready to wrestle with the valve cover re-install.
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 dboogie2288

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Re: Corrosion in number four spark plug hole
« Reply #10 on: June 02, 2017, 12:51:02 pm »
I'm now ready to wrestle with the valve cover re-install.

Hope you bought a new gasket...  :-[
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Re: Corrosion in number four spark plug hole
« Reply #11 on: June 02, 2017, 04:03:41 pm »
I replace the spark plug well gaskets every time but have been able to re-use the valve cover gasket multiple times.
97 C10,ZRX Front, Meanie Rear

Offline cmonSTART

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Re: Corrosion in number four spark plug hole
« Reply #12 on: June 02, 2017, 04:08:29 pm »
Excellent, glad it worked!  They're handy! 

Offline kkja13

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Re: Corrosion in number four spark plug hole
« Reply #13 on: June 02, 2017, 04:46:43 pm »
New well gaskets, but re-using the valve cover gasket.
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 kkja13

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Re: Corrosion in number four spark plug hole
« Reply #14 on: June 04, 2017, 12:52:03 pm »
Thanks cmonSTART for the lead on the tool.

Got it all back together yesterday.  Synced the carbs too and now running great.  Mena, Arkansas here we come on Friday.

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 kkja13

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Re: Corrosion in number four spark plug hole
« Reply #15 on: June 19, 2017, 06:52:07 pm »
Update:
Had a great trip up to Mena, AR and back with my son.  No issues with the Connie or the SV.  Great trip!

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)