Paul
can you see the bit on the carb like a throttle linkage? sounds to me like the govenor/linkage may be sticking if the revs are not picking up, if you can see the linkage manually pick the revs up a bit, dont go silly though!
hard to be much more help with out seeing it
as philc has said
main jet could be blocked as suggested, but thats inside the carb normally, try not to adjust the mixture screw, if you do count how many turns it takes to wind then in untill they stop, then when you refit them put them in all the way and back out to your recorded amount of turns
could just be residual of 2 stroke oil in there and it may wash out after a while
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