SOHC.co.uk Forums > CB350/400

Retapping spark plug hole

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PatM:
Any thread repair without removing the head has to be taken as a one stop attempt to reclaim the ally, but it is possible as previously said by others.

I cross-threaded my one of the heads on my CX500 many years ago and the plug literally fired-out when the bike started.
I took a plug and hacksawed a slot down the threaded shank, cleaned all the swarf off and used it to act as a taper-thread, with plenty of grease.

Yes, it worked and I did thousands more miles with that re-cut thread, but I always had to 'oil' the new plug on that head when i replaced plugs at service time.
The thread was 'tight' and I didn't have the funds back then to do the job correctly or worse-pay someone else to (us engineers are generally resourceful but certainly not wealthy)

Bryanj:
Back in the 70's fitted many helicoils without removing heausing well greased drill and tap.
Always gave customer the option of removing engine and head  as should be done or cheaper way as described on principle that if any alloy swarf did go in and need clearing out it would not damage anything and cost no more total than having engine out first.
Out of all the ones we did we only had to take one engine out and found that one had shattered the rings anyway

bobv7:
I find smear of Coppaslip or similar on the threads when refitting plugs helps reduce the chance of thread problems, as does not over tightening. ;)

Athame57:
I got lucky, the mechanic at the workshop I usually use fixed it for free!  :D Maybe he is preserving relations?   ;)

Moorey:

--- Quote from: Oddjob on January 04, 2020, 12:00:17 PM ---
--- Quote from: Athame57 on January 03, 2020, 10:52:29 PM ---I got lucky, the mechanic at the workshop I usually use fixed it for free!  :D Maybe he is preserving relations?   ;)

--- End quote ---
Is his name Norman Bates as he did that as well  ;D ;D ;D

--- End quote ---

 ;D ;D ;D

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