Honda Passport

[ghost1]

Greetings.

New to forum and have a question about a 1972 Honda Passport 70 that is my neighbors. Just replaced carb and plug and scooter will run fine with the air filter off, however, when put back on carb, it acts like it's starving for fuel. Checked to make sure no blockage in air filter box and also checked carb float. Can anyone point us in a direction that might be causing these symptoms?

Thanks