Dry and Wet Fouling Although there are many different cases, if the insulation resistance between the center electrode and the shell is over 10 ohms, the engine can be started normally. If the insulation resistance drops to zero ohms, the firing end is fouled by either wet or dry carbon. We often call this “Gas Fouled” because unburnt gas remains in the plug end. The accumulation of deposits on the firing end is influenced by oil leakage, fuel quality and the engine’s operating duration. Short runs are more prone to have deposit build up over engines that have been given a chance to reach ideal operating temperature. Spark Plug Wires Another maintenance item you should always look at are the Spark Plug wires. Make sure both ends are seated securely and there are no visible cracks or burnt spots as this will also decrease performance. Replacement Plug Wires can be had in a wide range from stock styles to neon flashing wires as well as thicker core performance wires. just like the spark plugs, plug wires start out with modest prices and can certainly travel into the outrageous. Fluids Lastly, are your fluids fresh? Keeping fluid changes up to date and up to the recommended levels is very critical to your motorcycle. Not only do fresh fluids keep the engine, transmission, and primaries clean by suspending the contaminates within, they also contribute to overall temps. The less fluid you have, and or the dirtier the oils are, the less efficiently they will do their job, resulting in increased operating temps or worse – engine failure. Keep the oils changed in accordance with manufacturers maintenance specs and your bike will be a happy camper.
Most of these conditions we will never experience with our motorcycles, especially if we adhere to the recommended maintenance schedule, but I felt the need to show you the importance of the extremes. This is also why I choose to change my plugs annually. It gives me a report card every season and keeps the situation under control by letting me address any abnormalities long before they become a bad situation. K and G Cycles (www.kandgcycles.com) has the spark plugs you need to keep your bike performing its best.