No, a bigger muffler does not directly burn more gas. The size of the muffler itself does not affect the fuel consumption of a motorcycle. The primary function of a muffler is to reduce the noise produced by the exhaust gases and to direct those gases safely out of the motorcycle.
Modifying the exhaust system, such as installing an aftermarket muffler or removing the muffler altogether, can alter the back pressure in the system. Back pressure is the resistance to the flow of exhaust gases.
In some cases, modifying the exhaust system can lead to a change in the air-to-fuel ratio, which may affect fuel combustion efficiency. If the modification results in decreased back pressure, it can lead to a leaner air-to-fuel ratio, potentially causing the engine to run hotter and leaner than intended. This can result in increased fuel consumption and may also affect engine performance and durability.
To ensure optimal fuel efficiency and performance, it's generally recommended to use exhaust systems and components that are designed and tuned specifically for your motorcycle model. If you're considering modifications to your motorcycle's exhaust system, it's advisable to consult with experienced professionals or refer to manufacturer guidelines to ensure proper compatibility, performance, and fuel efficiency.