Jean-Marie Raedts Posted July 23, 2015 Report Share Posted July 23, 2015 By the yearly inspection (MOT-like), my TR4A has to have a CO % lower than 4,5. During the test, the value varies from 3,5% over 4,5% to 5,5% and back again to 3,5% in 30 seconds. It means that the mixture in the carburetor goes from poor to rich and back to poor. The car is equipped with SU HS6 carburators. I heard from soaking false air, but I do not know exactly how to detect it (spraying inflammable gas on the rods and listen if the engine react?). Anyhow, if I would find a leak, how do I repair it? Can the level in the float chambers have an impact? Is a overhaul after 130.000 miles advisable. Thanks for your inputs. Jean-Marie Quote Link to post Share on other sites
stuart Posted July 24, 2015 Report Share Posted July 24, 2015 If you can then I would fit a proper rebuild kit to the carbs from here http://sucarb.co.uk/carburettor-kits/rebuild-kits/major-repair-kits-including-needle.html Stuart. Quote Link to post Share on other sites
jerrytr5 Posted July 24, 2015 Report Share Posted July 24, 2015 I should have thought 130,000 miles would make them well overdue for a rebuild. Float level will have an impact, but your rapidly fluctuating CO levels is more likely due to an air leak, possible due to worn spindles. Apart from Burlen services (link above) there is some useful information here (no personal connection or recommendation, but very informative): http://www.bobs-services.de/ Jerry Quote Link to post Share on other sites
Jean-Marie Raedts Posted July 27, 2015 Author Report Share Posted July 27, 2015 Thanks for the feedback. I'll see how to procede during wintertime. The car drives normal at the moment. Jean-Marie Quote Link to post Share on other sites
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