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D1 Needle Height
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thornebt
Somerset
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April 13, 2019 - 12:39 pm
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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.

Cheers.  Bruce.

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cocorico
Central France
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April 13, 2019 - 1:54 pm
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You could try the Tech Archive / FAQ. First post is the index, takes you to ** Please log in to view **

As I keep saying - the answer is usually on the forum, or if you are a member, in the Members' Area.

The Bantam Club Forum - all the answers are in there.

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sunny
Norfolk
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April 13, 2019 - 2:14 pm
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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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