Remember most 2 four setups are progressive linkage so at one to one are way too rich unless running wide ipen.


The s jets are the secondary jets and unless you're rich at wot that's not the problem. If you are rich at wot changing the secondary jets will help. For each 4% leaner move you want decrease the whole by .003. It's listed on page 14 of the tuning chart. The primary jet is bigger because the metering rod goes inside the hole. The rods have two sizes on them they move up and down to increase or decrease fuel.

They first thing you have to do is find out what carb and what size jets and rods are in them now. Here https://static.summitracing.com/global/images/chartsguides/e/edl-1400_fm.pdf look up chart for the number carb you have and it will show what rods and jets to use. A rod change is quick and you'll know what direction to go.

If they are 500 performer changing rod to #6 .067 x .055 it will lean out cruise and power 4% #11 change only jet to .083 and use the factory rods will lean both out 8% and lastly #10 change jet to .083 and rod to .067 x .055 it will lean them out 12%.

On the setting up the two carbs before you put on linkage the backing out of the 2 idle screws to set the carbs the same I was taught after getting them set to set the idle to 2,000 by by turning each idle screw the same number of turns and put your hand over each airhorn to see how even the suction on the carbs are because the difference in the carbs,cylinders and the manifold.You'd be surprised how close you can get them with just a minor turn on idle screws. Poor man's mercury gauge.

Good luck