SOHC.co.uk Forums > CB350/400

Retapping spark plug hole

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Athame57:
This morning I washed the bike and it couldn't start....oh well after a while I remove some spark plugs to inspect and clean, and for whatever reason I started the bike again. Alas, not before this ham fisted yokel stripped some of the thread in the right side spark plug hole, only about 30% of the spark plug is screwed in so there won't be any unnecessary riding. Will the workshop be able to retap the thread without pulling the top end off first?   

bobv7:
That can be done with a well greased tap, or you could try cutting some vertical slots in an old spark plug and try to reform the damaged section yourself. Plugs are best fitted by hand to start with so there's less chance of cross threading.

Arch stanton:
In the past. I have used a expanding thread tap with great success.
Grease it first. Then insert it into the plug hole. Expand it to suit the remains of the original thread. Then turn the thread tap. Out it comes bringing any debris with it. Because it cuts on the way out. Unlike a conventional thread tap.

Arch stanton:
I have just checked.
The tool is a. Reverse action thread tap. From Sealey tools.

davefirestorm:
Did the same thing on a car engine 38 years ago and bought this tool to run down and reclaim some thread using plenty of grease to catch any swarf created.
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