The carburetor or fuel injector continue to give the appropriate air and fuel ratio to a dysfunctional spark plug that isn’t arcing and isn’t creating the combustion needed to move the pistons up and down. When a motorcycle engine becomes flooded, that means the combustion chamber is filling with gas but isn’t being combusted. This will often give off a strong smell of gas. A flooded engine happens when you try to start your motorcycle and cranks over and over without actually starting. See my article here for other reasons why a motorcycle backfires.Ī flooded engine could also be a sign of one or several bad spark plugs. When there is fuel and air in your cylinder and the spark plug doesn’t ignite it, it gets pushed out of the cylinder on the compression stroke and as soon as it hits the hot exhaust header it combusts. This is caused when the spark plugs has an intermittent spark.Īn intermittent spark is when the spark plug usually fires just fine most of the time, but every once in a while it just won’t spark and your engine will backfire. Backfiring is when you hear random loud pops coming out of the exhaust. The second way you can tell your motorcycle spark plugs are going bad is if it’s backfiring. If it doesn’t arc and give off electricity at the right time, the gas it’s supposed to mix with isn’t where it should be and combustion is then thrown off. Misfiring is caused by the spark plug not arcing at the tip at the right time. Think of it like the bass player in a band you can obviously tell they’re off because the rest of the music doesn’t sound right. Misfiring is when your motorcycle is running on a steady rhythm and you can obviously tell it goes off of rhythm for a few seconds then catches itself back up. The first common sign that your motorcycle spark plugs are going bad is if your motorcycle is misfiring. The bigger the engine your motorcycle has, the more likely you’ll run into spark plug issues because you’re dealing with more of them. Knowing the symptoms of bad spark plugs can help you be better prepared in the future and help you fix your motorcycle much more quickly.Įach motorcycle is different with the amount of spark plugs they have depending on how many cylinders are inside the engine. Signs Of Bad Motorcycle Spark Plugsĭiagnosing bad spark plugs on a motorcycle can be difficult because the symptoms they manifest can often be associated with other issues. I’ve been able to learn a thing or two about them through my experience as a motorcyclist and can report what I’ve learned. Throughout my motorcycle riding years, I’ve replaced hundreds of spark plugs mostly because the motorcycles I restored required it. You can also look for physical signs on the spark plugs themselves which may include burn marks, broken tips, rust, and corrosion. What are the signs of bad motorcycle spark plugs? The signs of bad motorcycle spark plugs include your motorcycle misfiring, backfiring, or frequently having a flooded engine. If there’s any part of them that is malfunctioning, that could mean your whole motorcycle acts up and gives you problems. Spark plugs are small, but they provide a vital component to the functionality of the engine. This is especially true if you own an older motorcycle. If you’ve owned a motorcycle for more than a few years, you’ve probably run into a few issues with the sparks plugs.
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