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Solex 44PA1 Troubleshooting

Mike's Carburetor Manuals

After successfully (I think) dismantling and rebuilding my triple solex 44PA1 with the help of your tutorial video and your rebuild kits, I am surprised to find that the motor idles at no less than 1000 rpm, regardless of how I adjust the screws. The intermediate shafts are not pressing the throttle levers in neutral position. What could have gone wrong? I have been very careful to make sure everything is properly assembled.Did you remove the throttle plates? It could be you got those in backwards causing them to leak air. That would cause a higher RPM. I’ve done it myself before. Turn the carburetor upside down and make sure the throttle valves close completely with the idle screw turned out.

Flat Spot When Accelerating
You 1st need to determine if it is the carburetor, or something electrical.
Turn the engine off, remove the spark arrestor, pump the throttle. There should be a strong squirt of gas coming out of the hook that is located on the top of the carburetor.
No, or little gas?
Is there a gasket under the main discharge hook?
Is the discharge hook plugged?
When a 44PA1 sits for months, the bottom of the accelerator pump corrodes, blocking the main discharge hole.
The diaphragm may be too hard.
Is there a spring between the main body and the diaphragm.
Has anyone changed the cable going to the accelerator pump. That should be left alone, but make sure it is moving the pump arm when accelerating.

Bought two of your kits fitted to AQ130 VP. I have a problem with sooty plugs. Adjusted mixture screw to basic setting, 1 1/2 – 2 turns out from seated, but still black plugs and hard to start when hot?? Ignition has been strobed with Dwell checked. Please advise.You are running too rich, or the ignition isn’t firing as it should. One other possibility is the engine is worn and burning oil.The idle mixture has nothing to do with your plugs getting oily.Check your motors manual for fuel pump pressure, then test your fuel pump. It may be pumping too hard. New pumps are especially suspect.Test your float for leaks. Heat up some water and immerse the float in the water. Any bubbles is a leak.Is there a gasket under the main discharge (J shaped brass tube).Test the needle & seat to be sure it’s sealing. Blow through the inlet. It should hold up to 4 lbs or so.Is there dirt in the bottom of the float bowl. That would indicate dirt getting into the carburetor. Dirty gas tank, or dirty filter.


Float leaking – these are plastic. Usually good floats until someone steps on one.
Weigh the float. 7.3 grams
Needle & seat may have dirt holding it open.
Fuel pressure too high. Should be 4 lbs or less

No, or weak squirt
Most likely something is plugged up. The 1st suspect would be the brass discharge tube because it has such a small orifice. Remove it and do the test over to eliminate the part.Make sure the pump spring is between the diaphragm and the carburetor body. The instructions show this wrong.Blow through the holes as pointed out above to make sure air goes through all of them.

Discharge Nozzle Fell Out

Solex 44 PA1
That part is not available.

It does just poke into the hole. What you might try to do is find something like an awl that will poke into the brass part and try spreading the hole slightly so it fits tighter. I doubt it will come out if it fits in snugly.

Also you can try Permatex Red thread locker around the outside of the brass tube.
Updated on 04/27/2021

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