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How do I repair the stripped spark plug threads on my motorcycle?

My Harley has stripped threads. What do I need to do, step by step, to repair them?

asked by shan42 (23)

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Tags:  car repairs  how to  motorcycle

answers

You might be able to use a tap to repair the threads. Use a little grease on it to keep the shaving from falling into the cylinder. If this doesn't work then you may have to drill it out or install helicoils into the heads. If that doesn't work then you need use a bigger size plug.

6 votes

First you need to remove your head to insure you do not get metal shavings in cylinder. Then you need to find out what size hole and thread pitch it is. Then you need a thread chaser (buy at local auto parts store). Run the chaser through and reassemble. Done

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posted by jon40 (413)
4 votes

The best way is to remove the head (so you don't get metal in the cylinder). Then purchase a Thread repair kit in the proper thread size, follow the instructions.

4 votes

Repairing stripped threads on a spark plug is not recommended, always replace necessary parts for a motorcycle; however if you MUST repair, using #1 or #2 loc-tite is an option.

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posted by Karatta (44)
3 votes

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