SOLEX M 32 PBIC
If the problem persists then a rich mixture can be caused by fuel dripping into the manifold from the main jet casing which can also cause idling and starting problems as the contents of the float chamber can flood the manifold when the jeep stands after a run. I have come across this fault a couple of times and it is caused by the casting that supports the main jet coming loose from the mail body casting. As the two appear to be pressed together during manufacture a repair might be possible but a replacement carburettor is the better option.
Another part worth checking is the disc valve that operates the choke system. Corrosion or wear can result in poor mating between the surfaces which slide over each other. Provided the damage isn't too bad, lapping the surfaces in with a bit of metal polish can do the trick.
These carburettors were originally manufactured for Hotchkiss by Solex in France and later for the French army by Solex in India. As far as I know they are no longer made but ex-French army stock is still available from the usual dealers of spares in the U.K. and France though stocks are dwindling and prices continue to rise. The datasheets below came with one of these and contain useful information, particularly the second sheet. N.B. the comment about cold starting i.e. use the choke but do not depress the accelerator pedal! In a world of fuel injection not everyone seems to know this peculiarity of a good old Solex carburettor.
It is of course possible to get an aging and sick carburettor professionally rebuilt. Roger Holness (M201 no. 18088) had his rebuilt by 'Carburetter Exchange' at Leighton Buzzard (01525 371369) which is run by an ex Solex employee who he can thoroughly recommend. With the stock pile of spares held by dealers diminishing and prices rising a rebuild like this is likely to become a more popular alternative to purchasing a new carburettor. who he can thoroughly recommend.