carbs sweating at gasket joint Options

[JFG]

I was talking to someone at the weekend who advised it is likely to be the float height incorrect. Whilst i am in no under estimation of his knowledge i thought i would get some more input. No point opening them up twice.

Twin 40 weber idf. The motor ticks over very well when warmed up a bit and the short runs around the block (up to 2nd gear) runs nice. So no running issues so far.

The problem is at the gasket joibt in the carb itself, both of them sweat fuel from this point.

I've never had this before and my first thought was too much fuel pressure, i'm running a 3.5psi pump from cb performance but no regulator as yet.

I set the floats as per instructions i found so from here i'm not sure what to do.

These are my jet sizes etc


Chokes 28mm,
A.vents 4.5,
Mains 115,
Airs 200,
Em.tubes F11,
Idles 55,
Pumps 50,
N.valves 175.........

[nditiz1]

I was talking to someone at the weekend who advised it is likely to be the float height incorrect. Whilst i am in no under estimation of his knowledge i thought i would get some more input. No point opening them up twice.

Twin 40 weber idf. The motor ticks over very well when warmed up a bit and the short runs around the block (up to 2nd gear) runs nice. So no running issues so far.

The problem is at the gasket joibt in the carb itself, both of them sweat fuel from this point.

I've never had this before and my first thought was too much fuel pressure, i'm running a 3.5psi pump from cb performance but no regulator as yet.

I set the floats as per instructions i found so from here i'm not sure what to do.

These are my jet sizes etc


Chokes 28mm,
A.vents 4.5,
Mains 115,
Airs 200,
Em.tubes F11,
Idles 55,
Pumps 50,
N.valves 175.........

How old are the gaskets? Has the top of the carb loosened up? What is your current height for the float? I believe it is 10mm to top and dropped ~30mm

[Mark Henry]

Has the top of the carb loosened up? What is your current height for the float?

(IMG:style_emoticons/default/agree.gif) loose top, float height (overflow), float valve leaking or too many shims under it, float valve leaking under shims, float full of fuel (hole, waterlogged), pump pressure too high.
Also fuel enrichment valve stuck open.
The gasket at head and carb base is a vacuum point. fuel leaking down the carb is hard to see.

If it isn't leaking down the outside it could be leaking down the throats, if enough I guess it could fill it up to the point of leaking past a bad gasket.