Dave O Posted March 10 Author Report Share Posted March 10 Hi, I finally figured out why I couldn’t get my idle speed to anything less than 1000 without the engine conking out. I had the fuel mixture too weak! Had previously set this by turning jet screws down 2 whole turns from bridge then finer tuning from there (ended up with them about 2.5 turns I think). But thanks to some advice on this forum (Pete) I tried again starting at 3 whole turns down and ended up setting at probably another 1-2 flats down from this. Car now idles great at around 750! This is for HS4 carbs on a Spitfire 1500 if of use to anyone else. Just need to set fast idle now - presume I just do this with engine cold and choke out, and then just adjust fast idle screws to the correct speed? Many thanks again to everyone for the advice I’ve got through this forum Dave O Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 10 Report Share Posted March 10 really the fast idle screw just need to have a small gap to the cam ,choke fully in. the cam should give you the correct fast idle Pete Link to comment Share on other sites More sharing options...
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