Interesting issue. Can't get the SU 1 3/4" carbs to idle nicely on cold start. Won't go below 2K, and they seem to surge up and down in RPM. I am wondering if its time for a new fuel pump and regulator. A. -- Andre Rousseau - andre at gt6.ca '68 Triumph GT6 MK1 - http://www.gt6.ca/ Ottawa, ON, Canada