Author Topic: stripped spark plug threads  (Read 3237 times)

0 Members and 3 Guests are viewing this topic.

NE550

  • Guest
stripped spark plug threads
« on: July 08, 2008, 09:46:07 AM »
Any one have an easy solution to my spark plug problem?  I seem to have stripped the threads in the header and the spark plug does not want to go in.  I dont want to force it in. Any tips or tricks out there?

Matt

Offline Porscheguy912

  • I'm a Big Shot Ninja.
  • Hot Shot
  • ***
  • Posts: 342
  • It's MR. Moustache To you SIR!
Re: stripped spark plug threads
« Reply #1 on: July 08, 2008, 10:01:15 AM »
How bad is it stripped?
Is it just the beginning of the hole or is it the entire hole?

If just the tip, I would bring that cylinder up to TDC on its compression stroke, get a tap that is the same thread as the plug and gently run it through the hole. (careful not to hit the piston head though)
Then grab you vacuum cleaner, hook up the hose to it and see if you can duct tape a smaller tube or pipe to the end so you can suck out any debris from the cylinder.

If its too bad, then i would look into a helicoil kit and do the same process.

good luck, and hopefully its on #1 or #4 cause those middle ones can be next to impossible to get to with out pulling the engine.
Current: 1978 CB750F3
Past: 1974 CB550K

Offline mystic_1

  • Really Old Timer ...
  • *******
  • Posts: 6,071
  • 1970 CB750K
Re: stripped spark plug threads
« Reply #2 on: July 08, 2008, 12:07:55 PM »
Plenty of solutions to this problem, it's been discussed many times before.  Use the search function.

Here's something to get you started:  "Timesert"

:)

mystic_1
"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

NE550

  • Guest
Re: stripped spark plug threads
« Reply #3 on: July 10, 2008, 06:49:48 PM »
Thanks, I should have done a little research before I asked the question.  Thanks for the replies though and wish me luck, I'm gonna need it.

Matt

NE550

  • Guest
Re: stripped spark plug threads
« Reply #4 on: July 13, 2008, 09:20:52 PM »
I coated the tap with grease to catch the small bits, vacuumed, wiped clean, inserted spark plug.  No problem.  Much easier than I anticipated, 15 minute job.  I'm back on the road again.

This forum is GREAT!!!!

Offline mystic_1

  • Really Old Timer ...
  • *******
  • Posts: 6,071
  • 1970 CB750K
Re: stripped spark plug threads
« Reply #5 on: July 15, 2008, 05:28:10 AM »
This forum is a great HELP.  Give yourself a pat on the back for applying the information successfully.   :)

Glad you got it sorted.

cheers
mystic_1
"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline Porscheguy912

  • I'm a Big Shot Ninja.
  • Hot Shot
  • ***
  • Posts: 342
  • It's MR. Moustache To you SIR!
Re: stripped spark plug threads
« Reply #6 on: July 15, 2008, 10:25:38 AM »
I coated the tap with grease to catch the small bits, vacuumed, wiped clean, inserted spark plug.  No problem.  Much easier than I anticipated, 15 minute job.  I'm back on the road again.

This forum is GREAT!!!!

Awesome! I'm glad we could help!

Current: 1978 CB750F3
Past: 1974 CB550K