Carburation

[Geoff Dowdle]

peterg,
Assuming your carbs are Solex , your erratic idle can most likely be cured by tuning . How much mechanical experience do you have ?
You need a device to measure the air flow of the carbs to get the three throttle butterfies opening together .
Float levels must be set at 16mm below top face of main body .
As a starting point check that all jets and venturi are standard and not modified/drilled out , butterfly shafts are not worn, three carbs are a matched set (they need to be removed from the engine and stripped down to check that) .

It is quite difficult to get 60 year old carbs running correctly when various previous owners and so called " carby specialist" have attacked them in the past .

If you don't have confidence in tackling the job don't go any further and take the car to a Bristol specialist .

If the carbs are in poor condition it might be better fitting new 34ICH Webers with 27mm venturi ,jetted correctly they idle nicely and perform well.

What type of Bristol is the AB2 fitted to ?

Regards
Geoff