Spark plug threads

mattybpt · Post by **mattybpt** » Sun Aug 05, 2012 7:40 am

I appreciate everyone's suggestions, even Old Harley's. Goodysnap suggested a picture, and a picture speaks a thousand words. So what does everyone think?

Hoosier Tom · Post by **Hoosier Tom** » Mon Aug 06, 2012 3:54 pm

Where's the picture??????????

HT

mattybpt · Post by **mattybpt** » Thu Aug 09, 2012 9:56 pm

Someone had suggest to post pictures using flickr so this is the link. Have no idea if I did it correctly.

[url=http://www.flickr.com/photos/mattybpt/7750391488/][img]http://farm9.staticflickr.com/8293/7750 ... 20f2bc.jpg[/img][/url]
[url=http://www.flickr.com/photos/mattybpt/7750391488/]Honda Dream Spark Plug Threads[/url] by [url=http://www.flickr.com/people/mattybpt/]mattybpt[/url], on Flickr

OldHarley · Post by **OldHarley** » Thu Aug 09, 2012 10:34 pm

Here is mattybpt's photo

Honda Dream Spark Plug Threads by mattybpt, on Flickr

The bottom threads look decent, but the first few are messed up. I think a plug would hold if the first few could be chased to allow the plug to start in the hole.

Goodysnap · Post by **Goodysnap** » Fri Aug 10, 2012 9:18 am

The trickiest part is gonna be getting the tap started straight as to not ruin the existing threads. Looks savable though , I agree. Thanks OH for helping with the link.

Hotshoe · Post by **Hotshoe** » Fri Aug 10, 2012 5:19 pm

There are thread files available for dressing crossed threads like that.
The trick would be finding one for JIS threads.

Goodysnap · Post by **Goodysnap** » Fri Aug 10, 2012 6:17 pm

Correct me if I am wrong. Does JIS even apply to spark plug thread?

I used a universal compression adapter 12mm without troubles.

Is this not a standard 12mm plug?

This tool appears to rethread from the inside out, and may help keep the shavings out of the cylinder and work quite well for the outer thread damadge.

http://www.ebay.com/itm/KD-3689-Spark-P ... v4exp=true