SOHC.co.uk Forums > CB350/400

Should I use jointing compound?

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K2-K6:
Bryan, I wasn't intending to shoot you down on the silicone, suppose I've got a bit of a mortal fear of it having opened up some really grim rebuilds in which they'd just used so much of this stuff that it caused more problems than cured anything.

So sorry for putting you on the spot and  to offer an apology for making it sound like that.

Nigel.

Bryanj:
No offence taken mate, I have seen a filter screen nearly bunged with excessive Hylomar before now! i think it comes from the old Brit iron where if the goo wasn't at least 1/8 inch thich you still got leaks---still got them then most of the time!

taysidedragon:
As a long term rider and sufferer of old Brit bikes I had plenty of experience of rebuilding engines!

I usually used Red Hermetite(because that's what my dad had in the shed  :D) and never had any problems.

I think most problems back then were caused by ham-fisted owners levering cases apart and damaging the joint faces. Then they used far too much sealant to try and fill the damage. A lot of owners never seem to have heard of tightening down in an even sequence to avoid distortion and WTF is a torque wrench?
No wonder they leaked.  :-\

K2-K6:
I don't think many people think it through properly in that the better condition and more precise the engineering of the joint then the less sealant it usually requires to prevent it leaking.
I know we repeat it on here, but for some it's not easy to determine just how little sealant you need especially if they are new to this stuff.

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