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Carb needle and spring?
Posted: Sun Jul 24, 2011 7:05 pm
by Naadeslaus
Does anyone know what carb needle and spring that is best on a 1275 with twin HS2??
I have the David Wizard book somewhere,but just can't find it
Re: Carb needle and spring?
Posted: Sun Jul 24, 2011 7:21 pm
by chrisryder
if the engine is standard, can't you use standard needles and springs from an MG midget?
Mr Vizard says red springs and DN needles for a 'standard non-S 1275' with twin HS2's.
Standard engine but rich is red springs with BQ needles, and the same setup goes for a non-S 1275 with a modified head.
Modified Head with extractor exhaust = red springs and BP needles.
hope this helps.
Re: Carb needle and spring?
Posted: Sun Jul 24, 2011 8:38 pm
by bmcecosse
Better to NOT use twin 1 1/4" SUs. A single HIF 44 will be FAR better - with a BDL needle, and play about with the spring to find what suits best. If you feel you must use the twins - may as well try whatever is in the carbs at present. It has a good a chance of being correct as any other guess!
Re: Carb needle and spring?
Posted: Sun Jul 24, 2011 8:41 pm
by mike.perry
For the classic period engine see SU Reference Catalogue, Austin Healey Sprite 1098 & 1275. Stn Needles AN, Springs AUC 4587.[frame]
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