The valve system on your golf cart is vital to the running of the engine. This area of your caddie is responsible for the amount of air and fuel mixture that makes it into the motor. The fuel pump and carburetor work together to draw the fuel from the tank and shoot it up to the valve system. The valves are located in the head of the engine. You get two per cylinder but only one EZGO Valve Stem Seal for the intake side. As the crankshaft turns, it rotates rocker arms that your valves get rotated by. One opens as the other closes. One side brings in the fresh fuel and air mixture, and the other side vents out the burnt exhaust.Suppose the golf cart valve stem seal goes bad. In that case, it will allow unburnt moisture to seep into the cylinder during the exhaust stroke. Which pre-primes the system, overloading it with gas on the next intake stroke and causing a backfire. Call Buggies Unlimited today and get ahead of this problem.