sulzerman Posted September 7, 2021 Report Share Posted September 7, 2021 Hi all Car has been very running well, but discovered leak on front carb jet, so have replaced. Leak cured but now running very rough at low speed and tickover. I thought it would be a straight swap, as I have not changed any adjustments. Anyone any ideas? It is definitely the correct jet! many thanks Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 7, 2021 Report Share Posted September 7, 2021 Can only suggest the new jet is not fully returning to sit up against its adjusting nut often a SU headache can be the tube needs a 3 -4 mm cutting off as they seem too long and this hangs the jet up , have a quiet prod on the jet see if it pops back up fully there are few other reasons based on its just a jet swap you probable know i have a hate of anything SU and ive got two HS4s on my 2000 as well hey ho ! but apart from ridged floats they seem to be fine (say that quietly you know they listen ) Pete Link to comment Share on other sites More sharing options...
sulzerman Posted September 7, 2021 Author Report Share Posted September 7, 2021 Thanks Pete, I will check tomorrow Link to comment Share on other sites More sharing options...
sulzerman Posted September 12, 2021 Author Report Share Posted September 12, 2021 Checked the choke and operation of jets, all normal. So I fitted a replacement plastic pipe in original jet I used locktite to seal the pipe in the jet. No leaks and now running normally, so Venturi of new jet must be different/wrong. Thanks for your suggestions! Link to comment Share on other sites More sharing options...
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