NickJ Posted August 18, 2015 Share Posted August 18, 2015 So I have a pair of Dellorto drla downdrafts on my Lada, i've been chasing a flat spot coming off idle for a while, increasing the idle jets has improved it slightly but i'm now on jets that are way big compared to the suggested start point, added to that open road fuel consumption is not as good as it should be so my gut feeling says rich as.Onto the point of the thread, when the pump jet first flows its at about 1/3 stroke, should it flow right from first opening or once the progression holes have done their thing? i've adjusted the pumps to full stroke and it improves but will take some fiddling to get pump flow any earlier, can anyone confirm the start point for me?Hope to borrow a wideband next week to sort overall jetting next week before Hamner, would like to have the pump jets working right so I don't have to worry too much about that circuit.Cheers!Specs drla 3630mm venturi 122 main 55 idle (may be +/-1) Quote Link to comment Share on other sites More sharing options...
NickJ Posted August 20, 2015 Author Share Posted August 20, 2015 idiot post....Well I can now confirm the pumps operate from 0, pulled the diaphragms out to check they were correct and found I hadn't replaced the springs when I rebuilt them last year, with the springs in the flat spots gone and she gets off idle much nicer. 1 Quote Link to comment Share on other sites More sharing options...
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