8iggles Posted March 29 Report Share Posted March 29 These have been on my shelf since my racing days. SU Butec dash pot springs.. Red is standard for TR4 and 4A. Yellow is stronger. Easy to fit and try on a rolling road which is why I used to have a selection. These have probably been tried in this way but never used. No longer shiny but good. Two Pairs £10 plus postage. John Biggin Link to post Share on other sites
BlueTR3A-5EKT Posted March 29 Report Share Posted March 29 Bargain for the person rebuilding tired carbs. I have same in my carb spares box and did the swap to test trials like you. Just a point though….Part number on the box is AUC1170 which is for the 12 oz green spring. You must have decided they were the ones to get the right fuel flow across the rev range for your race engine. Easy to test the spring rate by pressing on a weight scales, if the coloured paint dab is faded or missing. For half weight changes in spring pressure add a 2 oz washer under the spring. Link to post Share on other sites
8iggles Posted March 29 Author Report Share Posted March 29 Peter, Yes I think you are correct about the boxes. I have tested the springs and they are what I have written on the boxes at the time. Cheers, John Link to post Share on other sites
Motorsport Mickey Posted March 29 Report Share Posted March 29 Hi John, Nice to see you on the forum again, hope Lynn and yourself are ok. Mick Richards Link to post Share on other sites
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