Spring

Modern unleaded fuels using 5%, or more bio-ethanol and many other potentially harmful additives (to the fuel system, not the environment) play havoc with the carburettor internals!
Failure to drain the carburettor/s for the winter lay up allows the petrol to turn into varnish, clogging up the carburettor jets and coating the float and float chamber, sometimes to the point where it becomes so difficult to clear, replacement of all the various internals may give preferable results?
Other suggestions of carburettor parts you may require are listed below:

1350102D00
1338327E00
1338326D30
0949400638
0949120012
1324014D10
1337046E10
1337046E20
1350217E20
1326714D10
1343247090
1341105320
0949330004
0935250903600
1338244030
1328105A00

It is sometimes just easier to fit new internals.

Add as many items as you wish to the same shopping cart, new fuel lines, diaphragms 1350717C01, circlips 1339440D20 and float chamber gasket 1325844B00 for example, and still only pay the same single fixed price shipping cost.

Pleas be careful to double check the part-numbers you order are correct for your model?