Engine runs but cuts out after a short time

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Truckertom85

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Bought a little quad for my son 50cc .
Ran perfect for the first 2 times of use . Went out the third time and engine was fine for first half hour or so . Then began cutting out after a short time . It starts easy runs for a short while 1 min at most then dies . I’ve managed to get it running on idle now fine and it stays running . Rev it up a bit runs great then cuts out again . Doesn’t really bog down just shuts off . Spark plug has a good spark , fuel lines are fine and filter . No vaccum on tank . It’s literally like at higher Revs it just doesn’t get the fuel to support the demand . Any suggestions ?
 

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