![]() ![]() ![]() It is not uncommon to see flames from the exhaust pipe at the time of backfire.ĥ Essential Tips for New Motorcycle RidersĪ motorcycle is said to run rich when the fuel to air ratio exceeds the manufacturer’s prescribed ratio. This would be heard as a loud bang and called a backfire. The super-hot excess fuel would escape into the exhaust pipe and combust there as soon as it comes into contact with freely available and highly combustible oxygen. If there is more fuel than air in the combustion chamber, the resulting combustion won’t be efficient enough. The Carburetor is a purely mechanical device. The fuel and air mixture ratio was set in the Carburetor in older motorcycles. ![]() With modern bikes, this is programmed into the ECU (Engine Control Unit) and is done in conjunction with various factors such as a valve and spark plug timings, for instance. The motorcycle manufacturer decides on this specific fuel to air ratio after extensive research and development, followed by rigorous testing. Any fuel combustion outside of the engine cylinders Too much fuel (engine running rich)įor a motorcycle engine, fuel and air need to be in a specific ratio inside the combustion chamber for efficient combustion. All fuel combustion should only occur within the engine cylinders during the compression cycles. Motorcycle backfire is also referred to as afterburn because fuel combusts outside of the engine cylinders and after the primary combustion from compression has already occurred. The main reasons for motorcycle backfiring are too much fuel, too little fuel, loose exhaust pipe, use of aftermarket exhaust, a bad fuel pump, Airbox leak, bad fuel filter, and a dirty carburetor. Motorcycles backfire when fuel combustion takes place in the exhaust pipe. Motorcycle backfire is the loud pop or bangs noise which comes from the exhaust pipe. In 19 years of riding, I have heard thousands of pops and bangs and seen exhaust pipes catch fire. I have personal experience with pops and bangs, given that my Kawasaki ZX-10R often does so when decelerating. While it can be loud and scary (if it catches you off guard) - you might wonder what causes it and what it means for the motorcycle. This varies from one driver to another and for individuals who are ill, tired or simply not concentrating, it can be much longer.ģ The 80mph examples are not here to condone breaking any speed limits, rather to illustrate the extra dangers faced by, and caused by, those people who exceed the usual highway limits.It’s almost certain you have heard a pop or bang (usually loud) from a motorcycle while its engine was running, and you were caught off guard by it. We are not referring to the British meaning of the word, which is the same as the American ‘sidewalk’.Ģ The ‘thinking distances’ shown allow for two-thirds of a second reaction time. Remember – 2: ……………Any fool can drive fast enough to be dangerous!ġ For non-US readers, ‘pavement’ is the American word for the road surface. Remember – 1: When the road is icy or covered with compacted snow, or diesel fuel has been spilled (which is a particular risk near certain gas stations) the ‘braking distance’ for your vehicle can be as much as ten times further than for dry roads/pavement. (Copyright ©, Eddie Wren, and Drive and Stay Alive, Inc., 2003 onwards) Stopping Distances for Dry Pavement/Road 1Īlmost two and a half American Football fields 3 Lastly, don’t forget that when you read the 60-0mph figures in literature for new cars, the automaker is giving you only the braking distance, not the overall stopping distance. Most frighteningly, Australian research has shown that the very people we expect to have the fastest reactions - young drivers - are particularly prone to effectively ‘freeze up’ with fear, at the sight of an unexpected hazard ahead, and their reaction time can therefore exceed two seconds. Under ordinary driving conditions, very few drivers indeed can get onto the brakes within half a second, and two-thirds of a second to a full second is more typical. The biggest factor in stopping distances is the speed at which a driver reacts to seeing the hazard in question. The most important point for any driver to remember is that if you double your speed - say from 30mph to 60mph - your braking distance does not become twice as long, it becomes four times as far.īecause there are differences between various vehicles, the following tables are for guidance only. With the advent of better brakes, vehicle stopping distances have reduced somewhat over the years but it has to be remembered that, no matter how good the brakes and tires, the laws of physics don’t change. ![]()
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