You just bought a 97cc baja doodle bug but it keeps cutting off when trying to start what is wrong with it?

First of coarse check the oil and gas. If that's good then check if it has access to the gas (near the motor there will be a gold knob ( don't trust me on colour). Make sure it is set to on). If that right then check the choke (its the most common mistake. On near the motor i think under the seat is a black switch. Make sure that is switched to yes when u start. If it works then remember to turn the choke off when you are going to ride (first u gotta heat up the engine). If that doesn't work you may have to take it in. Hope this helped =)