When driving a motorcycle, you may suspect that it is related to a blocked carburetor. At this time, loosen the drain screw to drain the oil, and see if the gasoline is clean by the way. After restarting the oil, the speed of the neutral puller is very high, and sometimes the fault can be diagnosed and eliminated. Blockage of the carburetor is usually related to impurities in gasoline. After some forms, for example, by adding different types of gasoline and gelling with gasoline in the early stages; or the gasoline is oxidized by air, dirty water, and impurities are precipitated by condensation. You can remove some of them by draining the oil properly.