Does someone know what type of needles are used in the Sprint carburettor. Rimmers catalogue gives CUD 1141, CUD 1159 and NZX8015. I suppose that CUD1141 is BBT but what are the others? My '76 Sprint engine vibrates by slight acceleration or gently opening the throttle and hesitates to accelerate. By full opening it runs perfectly.
I suppose it could have something to do with fuel mixture.
Thanks for all suggestion, Eric
On the carburettor float chambers there shold be little tags to identify which carbs you have.
The codes are for different years of manufacture
1973/4 AUD545........needle CUD1141 (BBT)
1976 AUD663.........needle NZX8015 (BDQ)
1976on FZX1257........needle NZX8015 (BDQ)
This information I have obtained from the SU Catalogue.
If there are no tags fitted Eric, then you could post a photograph of the carbs showing their jets, and we should be able to determine which type you have.
As Dave has already said, start with the ignition system.
The rotor arm to distributor connection, through the spring loaded centre contact, is a weak point that gave me bother in the past.
I note that Ian identifies these AUD 663s as 1976 only, and the FZX1257s as 1976 on, which isn't what the SU catalogue I have (pdf of) shows. Is this from a more detailed catalogue or from some other knowledge?
Maybe, if they were only used in 1976 between the AUD 680s and the FZX 1257, that explains why there are a few about, as 1976 production (4035) was only 1600 fewer cars than the total for 77-80 (5639).