SOHC.co.uk Forums > CB750
What are these plugs telling me?… and other questions!
McCabe-Thiele (Ted):
IIRC most old workshop manuals advise to fit new washer if you remove a spark plug to ensure good seating & avoid overtightening when re-fitting.
Can't say I have ever seen replacement plug washers for sale - then again I have not really looked.
Athame57:
I had a problem like this a couple of years ago, a thread problem in the spark plug hole. I took it to a mechanic early on and I really expected to be told that the engine would have to come out, but he said we can sometimes get away with it and he managed to repair it in situ with a quick tap. I now approach plug changes gingerly but no more trouble so far. But it begs the question when the engine finally comes out for rebuilding is it a good idea to get inserts put in if it can provide a more secure thread? This was common practice with CB250RS owners in the London dispatch industry, the bolts retaining the rocker box sunk straight into ally and stripped threads there were one of this bikes curses, I went pre-emptive on couple of my four RS250s.
Matt_Harrington:
Not to digress too much, what material is ideal for an insert if repairing a plug thread - also the type i.e. Helicoil or Timesert etc
Oddjob:
Timesert are stronger.
Matt_Harrington:
Thanks Ken. Brass, stainless or steel? ( a purely academic question....)
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