SOHC.co.uk Forums > CB350/400

Spark plug threads

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oldchuffer:
Thanks for all the advice - i will get a thread chaser and a time seal kit and have a go. I'll post the results when i can.

oldchuffer:
Update: I bought a 12mm thread chaser and luckily it fixed the cross threaded hole. I bought a timesert for the other problem but it wasnt clear which drill bit i would need. Eventually i discovered it needs a 12.3mm bit which i have now ordered (and checked it will fit in pillar drill). Fingers crossed.

Trigger:
If you have the head off, put inserts in all four. It is a pig if you put the head back on and find another weak thread has given up next year  ;)

oldchuffer:
Thanks Trigger, will do.

oldchuffer:
I assume i need to put thread locker on the outside of the timesert, which one would you recommend?

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