September 6, 2018
My 1955 D1 has a 523/1 Amal carb which I think is a D3 carb but the jet sizes are as specified for the D1.
I'm new to Bantams and not convinced the bike is running as well as it should. The spark plug couldn't be much blacker. I've cleaned the air cleaner and am running with the strangler wide open. I'm now wondering if I should adjust the needle height. This is currently on the middle of the five settings. I think I should probably lower it one setting to weaken the mix but I'd be grateful if someone could confirm this.
I've tried the Haynes manual and searching the forum but without success. I can't see that there is any other adjustment in the 523/1 carb.
June 23, 2013
January 9, 2013
hi Bruce most carb setings are 2nd from the TOP apart from the monobloc carbs fited to the D 5 and 7 wich are 4th from the TOP this is a starting place and ajustment may change you have to do about 3 mils to get the pest colluer on the s/plug and that is much harder with oil in the petrol the bantams fited with brass small end bushes run with moor oil than the ones with needle berings and the oilite bush & shaft has to be in good contion too
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