Neither does the plastic jet itself, sparker - it just takes longer to destroy it. I suggest you wash off the jet, let it dry thoroughly, and see if it is still OK. FWIW, to clean that jet I remove the O ring and spray carb cleaner through the orifice only, then wash in petrol. If it's actually blocked, I just put a 0.30 mm jet drill bit through the orifice.
I don't know if you can get a replacement for that tiny O ring, or you have to resort to buying another jet. You might try a PM to roebuck and ask him the question.
