Before the carburetors leave here, float levels and injection are set. As noted elsewhere, float levels
are set 2mm below factory spec to off set changes in fuel formulations. When you get your carbs on
the car, you may find they are still running a little rich overall (in rare cases, lean). First, check your
fuel pressure off the pump. If over 3psi, adjust that with the use of shims, or what ever is necessary
for the type of fuel pump you have. Should the fuel pump be fine, you can reduce the amount of fuel
into the carburetors through an adjustment to the injection amount or by float level. The first, and
easiest adjustment is to adjust your float level.
To adjust your float, loosen the 9mm nut (item 10 on the diagram), turn screw
IN 1/2 turn, tighten nut, repeat on other side**. Test drive the car. If improved,
but still running rich **, repeat, turning the screw in 1/4 turn. sometimes, you
can accomplish the same result by putting an extra shim under your float
Reverse is true if running lean, turn out to raise float level and increase fuel
(re)Setting your float levels. If you are trying to establish a base line for your
own rebuilt carburetors, Jim suggests taking off the top completely and then
measuring the height of your fuel. His recommendation is that it should
be 2mm BELOW the straight level bottom of the site bolt.
You can also try adjusting the injection amount by the pump rod. Loosen the
two nuts, move them in to increase the injection, move them out to decrease.
after setting the pump you have to measure the injection on both sides and then
do the same so injection is equal on both carbs.
** should there be an indication at start up that float is not functioning; or the
above instructions make no change, check the following:
remove top and look at how the float is sitting in the carburetor. Sometimes the
support bracket comes loose letting the float shift and then it gets stuck and
no longer "floats". If this is the case, adjust as needed. Possibly the float has
failed. Modern fuels are taking a toll on the phenolic floats of Solex. As there
are no new floats being made, we have to reuse old ones and can never tell when that float will fail.
When we ship the carburetors, they are laying down which can cause the float bracket to come loose
and jostle the float to an incorrect position. Yes, we could ship the carburetors standing up, which we
used to do. But that caused the pump link and/or pump rod to get damaged too often. To fix that, the
carbs had to come back to us. Adjusting the float is easier!!.