scooter jerks at 50 miles an hour like its been held back .

by kevin routley
(england )

ride a vespa px 125 .
its jetted up to correct jet and the carb has just been cleaned .
but when riding the scooter at high speed it jerks and holds back ,but after a while it runs ok .
does any body have any pointers as to what to do next .
cards ok and the fuel line isnt blocked .
any tips ?

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