Re: My (new to me) car is a bust. Nothing works.
Posted: Tue Feb 02, 2021 6:14 pm
I have run Zenith Strombergs with fixed needles and adjustable ones. The top ajustable ones only do 3 turns anyway. Set in the middle they do 1.5 turns up and 1.5 down and actually unscrew if you go beyond the 3 turns. As i recall the fixed ones were marginally adjustable on how they sit in the slide. I remember the manual showing a ruler put across the bottom onto the edge on the spring biased needle.
All this of course is irrelevant if the brass jet that the needle moves within is set wrong.
I recall 96 thou being the start point. Also these jets are an interference fit and require a flat punch to move them within the body. Carb guys have a tool that srews in the bottom that pushes the jet in via turning a tommy bar.
I would look at setting them there and then colour tune check the combustion flame to see how near you are.
I have an old thread on here about "dirty bottom" as my white rear end got mucky with rich mixture. Brass jets were too low set by a so called carb guy that did not know.
All this of course is irrelevant if the brass jet that the needle moves within is set wrong.
I recall 96 thou being the start point. Also these jets are an interference fit and require a flat punch to move them within the body. Carb guys have a tool that srews in the bottom that pushes the jet in via turning a tommy bar.
I would look at setting them there and then colour tune check the combustion flame to see how near you are.
I have an old thread on here about "dirty bottom" as my white rear end got mucky with rich mixture. Brass jets were too low set by a so called carb guy that did not know.