SOHC.co.uk Forums > CB350/400

Carb #2

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PatM:
In addition- as your carb is so clean, and my spare set not- Ive re-checked- it actually on the same side as the adjuster but as it said- YES its blocked. Just shows to us all-- compressed air is a very powerful medium!

Clem2112:
This hole puzzled me too,  when I re-cleaned the carbs yet again...
But they all have it  ;)

I have a worn out No2 carb which I am looking at now ...... Sad !

The idle circuit takes a few turns and several holes are drilled to achieve this with some of them joining the others up.

On the outboard side you'll see the same cast feature but without a hole.
The drilled hole on the other side is there to connect the idle jet to the tiny hole inside where the fuel emerges.
It is then blanked from inside with a brass insert which you can see inside the float chamber, dead centre... see the line of the cast pipe on the inside.
Unless this tiny insert was blown out things are as they should be.

There are two more blanks in the chamber roof too.

Clem2112:
Cross driiling is the phrase I was looking for.
The only way of simply creating oil galleries in crankshafts etc.

Footnote on the carburettor mystey hole.
I put a wire in and it seems to be plugged from the outside but quite deep down so it looks like an open vent at first glance.
Extremely unlikely to be air leaks past any plug but you could put some WD40 or fuel down there
to check.

Lynx:
Hi Clem,

Thanks for the reply. Yes I know they all have it. The trouble was when I sprayed carb cleaner into the pilot jet hole on this carb, it came flying out of this manufacturing hole ???. Not any more! I tapped it with a 4mm tap and loctited a screw into it ;D. This is more fun than squirting in some sealant and also I can remove it if necessary. I've got the carbs back together and on the bike but couldn't test it due to a lack of petrol. Hopefully tomorrow.

Clem2112:
Ah... So you had tested it.
..so maybe worth blocking this off any way , belt and braces... Could be small leaks on many of these?.  May try this approach.

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