Zenith 22 FZB Carburettor

[Dave Mann]

    I had one like this on the back of my bench for years until I found a length of 14 mm OD x 10 mm Id drawn steel tube at work then the repair procedure became obvious. There are two causes of this;
1) The mazak must be 100% pure otherwise it gradually disintegrates as Meccano found with their Dinky toys
2) Previous owners loose the slow running jet retaining screw and fit an over length replacement which is over tightened jacking the side of the housing off.
I've run out of the 14mm x 10 mm tube and haven't found a supplier who wants to sell me anything less than 20'