If there is a harder working part on a golf cart, we are not sure what it would be. The Yamaha Ignition Coil Four-Cycle generates hundreds of sparks a minute. This has to be done to keep the timing correct and the engine running smoothly. When they start to go bad, the rate of fire at first does not slip. The condition of the fore that is created starts to diminish. Think back to your high school chemistry class. What is the hottest color flame? Blue or white, right? This is what you want your spark to look like. If it is red or yellow, you can expect the caddie to run like a pile of garbage. Every time you change your oil, you should make it a point to check the condition of the spark. Get an in-line tester and make it easy.Your golf cart coil is what generates the high-level voltage to get a good hot spark. It is an amplifier of the 12-volt battery. It pushes it up into the tens of thousands of volts range to create a lightning strike over an air gap on the spark plug. Get one today from Buggies Unlimited.