* Check the fuel line. Make sure it's not kinked or blocked, and that it's properly connected to the carburetor.
* Check the fuel filter. If the fuel filter is clogged, it can restrict fuel flow to the carburetor and prevent the quad from starting. Clean or replace the fuel filter as needed.
* Check the carburetor. Make sure the carburetor is properly adjusted and that the jets are not clogged. Clean or adjust the carburetor as needed.
* Check the air filter. If the air filter is dirty, it can restrict airflow to the carburetor and prevent the quad from starting. Clean or replace the air filter as needed.
* Check the electrical connections. Make sure all the electrical connections, especially those to the coil and spark plug, are clean and tight.
* Check the battery. If the battery is dead or weak, it can prevent the quad from starting. Charge or replace the battery as needed.
