The secondaries on my Solex 4A1 are sticking...
The pressure to open them isn't constant...and they'll catch, and then stick open.
I lubed the little "sliders" without and change.
It's my understanding that one of the causes of the stickings is warping of the top plate?

What's the fix?

__________________
-lee
'83 300CDT (286k)

former proud owner of:
'85 mercedes euro 300TD
'80 mercedes 300TD
'77 mercedes 280e
'80 mercedes euro 250
'82 mercedes euro 250

Make sure the final wing nut bolt used to secure the air cleaner to the carb is not too tight. This is what can cause the top section of the Solex to warp.

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)

yeah, they stick even with the air filter / wing nut off.
now what?

__________________
-lee
'83 300CDT (286k)

former proud owner of:
'85 mercedes euro 300TD
'80 mercedes 300TD
'77 mercedes 280e
'80 mercedes euro 250
'82 mercedes euro 250

Are they the top airflow operated butterflies (air valves), or the secondary throttle butterflies in the carburetor base?

they're the butterflies, in the top.
is that good?

__________________
-lee
'83 300CDT (286k)

former proud owner of:
'85 mercedes euro 300TD
'80 mercedes 300TD
'77 mercedes 280e
'80 mercedes euro 250
'82 mercedes euro 250

Just behind the air cleaner stud is the air valve metering rod piston. I call it the centering piston, but I am sure that's not the name. It's the "T" shaped thingy that holds the secondary metering rods, and is lifted as the air valves open. The piston sometimes lightly sticks in the bore. Just squirt a small dose of WD40 down the bore and that should fix it. I've had it before, and if fact just had to do it again yesterday. Hope it works for you like it does for me.