Replacing the head vs heli-coiling -
Engine Tech This forum will be dedicated for internal Engine threads , discussions, upgrades etc etc

LinkBack Thread Tools
post #1 of 4 (permalink) Old 04-23-2017, 05:51 PM Thread Starter
Training Wheel Hero
Join Date: Dec 2016
Posts: 35
Thanks: 0
Thanked 5 Times in 5 Posts
Feedback Score: 0 reviews
Replacing the head vs heli-coiling

So I finally have time again to get around to fixing my bike. From my other posts, I ended up realizing I need to not only replace the harness but I goofed up the threads for a spark plug hole.

I've been shopping around and a head off a junked bike isn't too expensive. My main question is this:

Should I replace the head I have, or yank the head (I have to do a shim job anyway on it and pulling the head doesn't seem TOO difficult) and bring it into a machine shop for helicoiling the spark plug hole?

Second question: How difficult is it to yank the head? Can I do it without dropping the engine? The placement of the engine seems pretty terrible. Hayne's manual says I have to basically pull the bike in two to get it out.

zersa is offline  
Sponsored Links
post #2 of 4 (permalink) Old 04-23-2017, 07:42 PM
Knee Dragger
Join Date: Jul 2012
Location: DFW, TX
Posts: 233
Thanks: 30
Thanked 37 Times in 35 Posts
Feedback Score: 1 reviews
I'd try to repair before replacing, but with a timesert instead of a heli-coil.
PatrickRR is offline  
post #3 of 4 (permalink) Old 04-24-2017, 03:59 PM
Knee Dragger
Crashchris's Avatar
Join Date: May 2015
Posts: 185
Thanks: 13
Thanked 44 Times in 37 Posts
Feedback Score: 1 reviews
I would replace the head. But that's just me. If it's stock it's rather cheap.

Pull the engine.
Crashchris is offline  
post #4 of 4 (permalink) Old 04-24-2017, 11:21 PM
Knee Dragger
keeblerkhan's Avatar
Join Date: Mar 2017
Posts: 105
Thanks: 0
Thanked 40 Times in 28 Posts
Feedback Score: 0 reviews
You could try repairing/chasing the threads with a backtap tool as a first resort, depending on how badly you messed up the threads.<br />
<br />
Not to be a dingaling, but if you are stripping spark plug threads, you should look deep within your soul and decide if your mechanical aptitude is up to the job of removing and replacing the head without screwing something else up. You might be a mechanical genius or a klutz but you should think about it first.
keeblerkhan is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome