My brother has a quadracer and he bought brand new tires but neither one on neither side will take a seal and the rims aren't damaged and they are clean to but they just won't hold air

 

Check the valves.

 

valves are good. Coming rightout around the rim

 

OK, take the tires off the quad, make sure they have air in them and get some soapy water and spray it on them. Check area around the rims to ensure seal, and check the valve stems to make sure they are tight also like Sam250 said. You will see soap bubbles if air is leaking out. If no leaks there, check the contact surface of the tire itself.If your problem is the tires not popping on the bead, try the same thing. Put some dish detergent on the lip of the tire where it seals on the bead to allow it to pop on easire. Also, please be sure that you have the right tire and rim combination. What size tires, and what rim size does he have?

 

Oh, and it will take alot of air pressure to pop the tire on the bead!