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Old 01-31-2012, 12:10 PM   #1
TomballD
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Damaged Spark Plug Hole Help

I have a 1981 XR80 with a stripped spark plug hole that I have tried to re-tap at the original 10mm x 1.0 taper. Didnt work. Now I am in the process of using a helicoil type insert , but that is proving tricky to thread into the cylinder, and once the insert is in cylinder the 10 mm x 1.0 taper plug will not go into the 10mm x 1.5 insert (no luck finding a 10 x 1.0 insert). Any body have any advice. I am considering JB welding the insert to the actual plug and trying to thread it into another insert or just the damaged hole. I figure this is of some relevance to the thread. I figure this can be applicable to any type of stripped soark plug hole. My other options which I dont want to pursue because it is the nieghbors bike is to either:

1) Replace the cylinder entirely (Dont want to put the time into it, and its hard to find clean cylinders from that year at a good price)
2) Try and tap in a 12 mm plug of the same heat range.


Any help is appreciated, I will post pictures later for further clarification.
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Old 01-31-2012, 02:23 PM   #2
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Is the head off the bike?
If so bring it by for me to look at before you do any more to it.
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Old 01-31-2012, 02:48 PM   #3
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Quote:
Originally Posted by Patrick View Post
Is the head off the bike?
If so bring it by for me to look at before you do any more to it.
I havent pulled the head, but know that is the final and ultimately easiest and most effective way to sort this out. I actually have to come back in so I can pick up some brake pads ya'll had to re-order, so maybe in the next day or so I will bring it in. Thanks Patrick.
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Old 01-31-2012, 02:50 PM   #4
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which one was this?
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Old 01-31-2012, 02:54 PM   #5
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Quote:
Originally Posted by Solracer View Post
which one was this?
The white one. I have been meaning to start a build thread for them, but been working 80 hours a week, so just getting it done is my priority. The red one (mine) on the other hand I ride all the time!
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Old 01-31-2012, 02:57 PM   #6
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you gonna tear em down and do them from ground up?
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Old 01-31-2012, 03:04 PM   #7
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Quote:
Originally Posted by Solracer View Post
you gonna tear em down and do them from ground up?
I'm going to try and restore the "Lick My Sack Racing" bike to its 1981 glory in the most budget friendly way possible. It still has the original frame paint, seat cover and most other original parts. So it will be a project I can ride and work on at the same time.

The white one is my neighbors. He doesnt even know how to start it, so to say his riding skills need work is an understatement. So that one I am just trying to get running reliably so he can abuse it and learn. It was running well for the first week, and then I think he tried to tighten the plug and just shredded the threads. I actually kicked started it and the plug blew out like a shotgun going off. It was actually pretty bad .
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Old 01-31-2012, 03:09 PM   #8
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Quote:
Originally Posted by TomballD View Post
I'm going to try and restore the "Lick My Sack Racing" bike to its 1981 glory in the most budget friendly way possible. It still has the original frame paint, seat cover and most other original parts. So it will be a project I can ride and work on at the same time.

The white one is my neighbors. He doesnt even know how to start it, so to say his riding skills need work is an understatement. So that one I am just trying to get running reliably so he can abuse it and learn. It was running well for the first week, and then I think he tried to tighten the plug and just shredded the threads. I actually kicked started it and the plug blew out like a shotgun going off. It was actually pretty bad .
no vid? lol
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Old 01-31-2012, 03:14 PM   #9
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You would bring that up. Give me a day to edit what I have and I'll throw one up.
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