SOHC.co.uk Forums > CB350/400

Cylinder head problems

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watty51:
Hi All,
Just took cylinder head off Cb350f due to 2 maybe 3 new spark plug threads nead a re thread, and had a few problems removing it, this is why.

The PO had used a silicone gasket maker on top of the cylinder head gasket and it  “super glued” the cylinder head on....any now the reason why they did this become apparent when I managed to get it off.

The face where the gasket sits is damaged and I’m presuming the silicone was put over these areas to provent a leak, in fact I had no leaks at all. The damage does look a lot worse on the photos though.

Is this cylinder head repairable ?

Looking at the valves the engine has been running rich so needs a good decoke, the exhaust valves have a mark in the middle of all of them, ( see photo) what is this due to or is that how they are meant to be.

And finally if it’s saveable does anyone no where I can get the work done, West Midlands, Warwickshire area but don’t mind travelling or posting out.

Hope I’ve explained everything ok.

Trigger:
Depends how deep they are on the head, a skim may clean it up if not too deep  ;)

watty51:
Hi all,

Are these carburetor insulators meant to be a soft rubber like the carb type because these ones are a hard rubber.
Thanks.

Trigger:
Soft but, not that soft. Hard to tell how soft something is without having it in the hand. Take them off, boil a kettle and put hot water in a bowl, drop them in for a couple of minutes and should go soft but won't stay soft. Cracks are more important than softness.

taysidedragon:

--- Quote from: Trigger on June 12, 2020, 10:38:11 AM ---Soft but, not that soft. Hard to tell how soft something is without having it in the hand. Take them off, boil a kettle and put hot water in a bowl, drop them in for a couple of minutes and should go soft but won't stay soft. Cracks are more important than softness.

--- End quote ---

There's a joke there somewhere! 😂😂

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