On my Razor dirt rocket mx 350 motor revs but the chain is not moving wheel?

Try connecting the red wire to the + battery post and the black to the - post.

Take it back to Walmart

Loosen both rear axle nuts, pull wheel back but keep it straight in the frame. retighten bolts

Have you tried removing plastic chain guard and making sure chain is not off track i had this problem and that is all it was.

The battery installation guide is available here
http://www.razorama.com/razor-installation-guides.html

It shows how to remove the covers.

have a read of the trouble shooting guide here
http://www.razorama.com/razor-installation-guides.html

Check that the chain is still on both the drivewheel(the part on the motor) and the freewheel (the part on the wheel). If that is connected well, check if the chain moves when you rev it. If the chain moves but the wheel still doesn't move, the freewheel, or gear connected to the wheel, is probably broken and you need to get a new rear wheel. If it doesn't move, the motor is most likely shot, and you're going to need to order a new motor, unless you are confident in taking apart the motor and replacing whatever needs replacing within it.

the back wheel won't move it try to move but it won't it's making a loud noise.every time you give it gas.what could that be...

Have you checked for a frozen bearing