Rob123 Posted July 13, 2017 Share Posted July 13, 2017 SU carbs on Spitfire mk3 engine.Have tuned the carbs with the ear and hose method. All running nicely however when adjusting the idle speed with hose in ear as well as the hiss of air there is a mechanical chatter as well. Any clues as to what is going on greatly appreciated. Quote Link to comment Share on other sites More sharing options...
poppyman Posted July 13, 2017 Share Posted July 13, 2017 valves opening and closing Quote Link to comment Share on other sites More sharing options...
Don Cook Posted July 13, 2017 Share Posted July 13, 2017 Possibly the carbs aren't seating on the manifold properly. Quite a popping/clatter when that happens! Quote Link to comment Share on other sites More sharing options...
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