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Bob
Would be interesting to see if The Geoff Dowdle method you refer to with the copper tube and plastic tube gives the same result as Tony Byfords method. Just one thing, I believe Geoffs metod should read the smaller Gs Starter Petrol Jet not the main Jet Gg .
Tony's method is to invert the Solex Carburettor top, Screw in the needle valve ( Nv.) place a flat edge across the face and the needle valve should close off the fuel supply at 3.3mm (Tip of valve to face of carburettor top. If the fuel doesn't stop flowing then a thin aluminium washer should be used to bring the needle closer to the float to ensure the needle valve closes fully.
Tony's method is quicker and simpler, However both methods produce the same result, that of stopping the flow of fuel to the float chamber.
Solex Manual and other workshop manuals do not give a figure as correct authentic Solex components should give correct setting to work from the day the carburettor left their factory.
If anyone has used both methods it would be great to learn if they give same figure / result.
Tony's method has been well proven for 30years or more with Bristol engines in Ace, Acea, Greyhound ,Cooper Bristols and Arnolt Bristol. ( Race & Track. )
Any feed back appreciated.....
Keith