my qt50

yamaharules /
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hi,

i have a 1980 yamaha qt50,and i need help i bought a new needle valve for it and put it in but when i ride it it'll start moving really goood and get movin fast but all of a suddon it boggs way down some times stalls but then it some time after bogging it takes off again or stalls whats wrong? cause i need help.

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