Did you take the carburetor off and take it ALL APART and pull out the main jet...which is a small brass piece in the middle of the float bowl...and look through it?...... And was this moped sitting for a year or two without running?..... One other thing to check...... pull the fuel line off at the carburetor and see if fuel flows out..... If your moped has a vacuum operated petcock you will have to pull the other rubber hose off and suck on it to let fuel flow.... If it doesn't flow when you do those things then the petcock needs to be removed and cleaned...(the petcock is the thing on the gas tank where the fuel line comes from, it either has an on/off lever or another rubber hose running to it)..... Try this stuff if you can.