Sparkplug threads stripped - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 11-06-2010, 11:59 AM Thread Starter
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Sparkplug threads stripped

PO told me he had Iridium plugs when I bought my bike in Aug 2010. Last week started firing wierd like it was missing so today I decided to check the plugs and replace with new. Back right plug in & out no sweat. Pull the front right ( under the throttle) go to replace and start to screw it back in and it locks up. Put the plug socket on and screw it in two more 1/4 turns and it gets much tougher. Unscrew it and there are aluminum shavings all over the threads. Figured I better hold on before I really mess something up. Any ideas or suggestions.

2006 w/ 3124mi.
new to me Aug. 2010
X2-15L Battery
Iridiums
Mustang One Piece Studded
Fluids replaced
H4 Bright White Headlight

ALAS sold to a great guy in Birmingham
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post #2 of 12 (permalink) Old 11-06-2010, 12:30 PM
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Quote:
Originally Posted by 76dore View Post
PO told me he had Iridium plugs when I bought my bike in Aug 2010. Last week started firing wierd like it was missing so today I decided to check the plugs and replace with new. Back right plug in & out no sweat. Pull the front right ( under the throttle) go to replace and start to screw it back in and it locks up. Put the plug socket on and screw it in two more 1/4 turns and it gets much tougher. Unscrew it and there are aluminum shavings all over the threads. Figured I better hold on before I really mess something up. Any ideas or suggestions.
Since you haven't gone so far as to completely strip out the hole and stopped.I would suggest getting a metric tap or thread chaser and clean the threads up sounds like you have plenty of threads left,just be sure to start the tap or chaser straight and use antisieze lube on your plugs when reinstalling them.Also after tou get the threads straightened up(use grease on your tap in the flutes to catch most of the shavings)leave the plug out and crank the engine to blow out any remaining aluminum shavigs,before start up and you should be alright if the plug torques down to specs. wait around others may have suggestions as well.




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Last edited by denny6006; 11-06-2010 at 12:32 PM.
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post #3 of 12 (permalink) Old 11-06-2010, 12:34 PM
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Quote:
Originally Posted by 76dore View Post
PO told me he had Iridium plugs when I bought my bike in Aug 2010. Last week started firing wierd like it was missing so today I decided to check the plugs and replace with new. Back right plug in & out no sweat. Pull the front right ( under the throttle) go to replace and start to screw it back in and it locks up. Put the plug socket on and screw it in two more 1/4 turns and it gets much tougher. Unscrew it and there are aluminum shavings all over the threads. Figured I better hold on before I really mess something up. Any ideas or suggestions.
If it is in fact stripped, it sounds like time for a helicoil. Is it possible you had it crossed threaded and the damage is not so bad that a plug will still thread in?

2004 VN750 "Rosanna"
Acquired March 6, 2010

Done:
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Big Crank ETX15L AGM Battery
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post #4 of 12 (permalink) Old 11-06-2010, 02:21 PM Thread Starter
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Thanks for the info folks. I must have cross threaded because the plug stopped with 3/5ths of the threads still showing. I didn't go any further.
Appreciate any further info and again thnx for the input. Thought I had REALLY screwed the pooch..........

2006 w/ 3124mi.
new to me Aug. 2010
X2-15L Battery
Iridiums
Mustang One Piece Studded
Fluids replaced
H4 Bright White Headlight

ALAS sold to a great guy in Birmingham
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post #5 of 12 (permalink) Old 11-06-2010, 07:10 PM
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Did the threads on the old plug look good?

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post #6 of 12 (permalink) Old 11-06-2010, 08:05 PM
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Quote:
Originally Posted by 76dore View Post
Thanks for the info folks. I must have cross threaded because the plug stopped with 3/5ths of the threads still showing. I didn't go any further.
Appreciate any further info and again thnx for the input. Thought I had REALLY screwed the pooch..........
If stripped it can easily be fixed using the old helicoil method. Here is a newer alternative (and looks better than old helicoils) method posted in another thread by Flightcontrol.


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post #7 of 12 (permalink) Old 11-06-2010, 11:56 PM
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i use an old straight spark plug boot to hand thread the plugs in . this goes for cars lawnmowers anything with a spark plug then snug em down with a ratchet

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2005 1600 nomad sold

1987 kawasaki vulcan 750 SOLD

1985 kawasaki vulcan 700 parts bike maybe
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post #8 of 12 (permalink) Old 11-09-2010, 07:08 AM Thread Starter
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Took my bike to "my guy" in Huntsville, He said it looks like the PO put loctite on the threads. Does anyone have a suggestion on breaking the "LOCK" the remaing 3 plugs.

2006 w/ 3124mi.
new to me Aug. 2010
X2-15L Battery
Iridiums
Mustang One Piece Studded
Fluids replaced
H4 Bright White Headlight

ALAS sold to a great guy in Birmingham
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post #9 of 12 (permalink) Old 11-09-2010, 08:47 AM
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If you got the first one out successfully, I'm guessing the rest will come out OK too. I would wire brush the threads to remove any residual threadlocker and run a greased tap down the cylinder threads to remove any threadlocker there. If the plugs are iridium, they should be good for the life of the bike. Use anti seize compound on the plug threads when you get ready to install.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
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post #10 of 12 (permalink) Old 11-17-2010, 07:08 AM Thread Starter
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Man are you guys smart

Previuosly posted about stripped plu wall threads, Ordered a 12mm KD Back thread chaser. A little grease, stuffed the cycilinder with oil soaked cotton clothes line. Slid the back tap in. expanded the threads to 12mm. counterclock wise out. Clean as a whistle. took my long neck hook forceps, pulled all the clothesline. a tad of never seize and in went the iridium, little snug at first but 1/4 in started to spin by hand. Wire attached and satarted right up. Might be me imagination but it seemed to run a little "off" but then fell int her groove.
If Professor Lance is reading this, I wuld like to bring my SheRaa over to you and let you do your magic.
Am looking for a 1986 V 65magna and/or a later model V strom soon. No kids at home year round riding, my 750 needs some stablemates.
But need to make sure my main squeeze has everything right on her.
thnx for the sage advice from you brilliant Vulcaneers

2006 w/ 3124mi.
new to me Aug. 2010
X2-15L Battery
Iridiums
Mustang One Piece Studded
Fluids replaced
H4 Bright White Headlight

ALAS sold to a great guy in Birmingham
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