loewent via CarKB.com wrote:

> The current symptoms include:
>
> 1. Brown smoke coming from the exhaust, indicating that the bike is
> overfuelling and running very rich.
> 2. Intermittently runs on one cylinder, indicating overfueling and fouling
> of one cylinder.
> 3. Gas occasional pours out of the overflow of both carbs, indicating a
> problem with the floats or the fuel shut off valve.
>
> Thanks for your input.

It seems unlikely that both float valves would be hosed, but maybe some
dirt found its way from the tank and screwed them up.

Pull the carbs and remove the float reservoir bottom end caps.
Dependiong on the design, you should have instant access to the float
and valve(s). There is probably a simple pin to pull/slide that will
release the floats. Pull them, watching for jumping valve components as
you do so. Check the valve seats and the needle valve for wear, dirt,
corrosion, etc.

-Greg