Spark plug threads stripped out - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 19 (permalink) Old 11-30-2012, 10:49 PM Thread Starter
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Spark plug threads stripped out

Can a head be repaired if the spark plug threads are stripped or am I looking at a new head?
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post #2 of 19 (permalink) Old 11-30-2012, 11:31 PM
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damn that is a tough one...can you use some helicoils or better known as threaded inserts...easy fix if you can find the right size...run the next size larger tap then just screw in the insert that is the same size as the sparkplug...
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post #3 of 19 (permalink) Old 11-30-2012, 11:36 PM Thread Starter
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Originally Posted by mgosset1 View Post
damn that is a tough one...can you use some helicoils or better known as threaded inserts...easy fix if you can find the right size...run the next size larger tap then just screw in the insert that is the same size as the sparkplug...
Yea...I considered that. I'll be stopping the the dealership tomorrow morning and get their take on it...I'll post the answer I get from them.
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post #4 of 19 (permalink) Old 11-30-2012, 11:45 PM
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there is more than one right answer,,,,depends on how correct you want to fix,,,,or just get by,, quick or shade tree,,,,,,
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post #5 of 19 (permalink) Old 12-01-2012, 12:15 AM
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A good machine shop should be able to fix that for you.

Helicoils and threaded inserts are 2 different critters that are similar. A helicocil is a wire thread and sore looks like a spring. A threaded insert is solid and has threads on the inside and outside and they come in a couple different thicknesses.
Here is a photo of the 2 the threaded insert is the 1st one and and 2nd one is the helicocil.

http://www.denlorstools.com/autoblog...d-repair-kits/
Attached Images
File Type: jpg Threaded insert.jpg (6.1 KB, 17 views)
File Type: jpg helicoil .jpg (5.3 KB, 16 views)
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post #6 of 19 (permalink) Old 12-01-2012, 03:03 AM
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I would suggest a threaded insert over the helicoil. I have used Timesert threaded inserts on my Evo cases and they are holding up better than the stock setup.


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post #7 of 19 (permalink) Old 12-01-2012, 06:59 AM
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DONT use a heli-coil,we use threaded inserts.100%,life of the bike fix

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post #8 of 19 (permalink) Old 12-01-2012, 07:47 AM
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Originally Posted by prodrag1320 View Post
DONT use a heli-coil,we use threaded inserts.100%,life of the bike fix
I've used both. Helicoils have a tendency to back out regardless of the amount of thread lock used. The plug is the hottest part of the head. The inserts actually bottom out at the start of the hole and that not only helps to prevent loosening but it also prevents moving farther into the hole. You'll pay slightly more but its worth it in my opinion.

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post #9 of 19 (permalink) Old 12-01-2012, 08:15 AM
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Another vote for no Helicoil. Not even in a bike application they like to back out. One time use is fine but not for loosening and tightening like a plug.

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post #10 of 19 (permalink) Old 12-01-2012, 10:26 AM
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go to harleytalking.com their posting touts time sert as a great insert for sparkplugs.
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