A good trick for sealing beads is to leave the valve out and shoot 3 or 4 VERY small squirts of ether starting fluid inside the tire, then throw in a match to ignite. The resulting small explosion with "blow" the bead on. Then use a rag to insert the valve before all the pressure bleeds off, and air it up. This is how big truck tires are mounted, and works well for ATV's too Be careful!!! Not too much juice!