Analysis and elimination of the reasons for the failure of the four-stroke engine
Acceleration is an important indicator to measure the performance of motorcycles, and it is also one of the main characteristics to evaluate the good condition of motorcycle engines.
First, the engine is poorly accelerated, the main features of flameout
a) The engine is difficult to start. After starting, the muffler emits black smoke and the throttle is larger. The thicker the smoke, accompanied by the release of the exhaust pipe, the body rushed, the engine speed did not rise and fall, and turned off.
b) Engine starting difficulty (starting well after closing the choke), the engine is weak when accelerating the driving; the throttle engine is slow to respond, and there is a forward rush phenomenon, the carburetor has a tempering phenomenon, and then the flame is extinguished. Closing the choke, the throttle is slightly better, but unstable.
Second, the main reason for the engine acceleration is easy to extinguish
a) The gasoline oil circuit of the four-stroke motorcycle with poor oil supply is generally composed of the fuel tank, the fuel tank switch and the oil pipe. Due to the lack of maintenance for long-term use or the gasoline is too dirty, the fuel tank switch will be blocked half-blocked; or the fuel tank cover vent hole is blocked; It will cause siphoning in the fuel tank, and the oil supply will be poor at high speed. For the scooter, it is necessary to carefully check whether the vacuum tube leaks, otherwise it will affect the oil output of the automatic fuel tank switch, which also leads to poor high-speed oil supply.
b) Poor carburetor work Poor carburetor malfunction is one of the most important reasons for engine acceleration and easy flameout. One is caused by the rich combustible mixture provided by the carburetor when the throttle is opened.
First, the engine is poorly accelerated, the main features of flameout
a) The engine is difficult to start. After starting, the muffler emits black smoke and the throttle is larger. The thicker the smoke, accompanied by the release of the exhaust pipe, the body rushed, the engine speed did not rise and fall, and turned off.
b) Engine starting difficulty (starting well after closing the choke), the engine is weak when accelerating the driving; the throttle engine is slow to respond, and there is a forward rush phenomenon, the carburetor has a tempering phenomenon, and then the flame is extinguished. Closing the choke, the throttle is slightly better, but unstable.
Second, the main reason for the engine acceleration is easy to extinguish
a) The gasoline oil circuit of the four-stroke motorcycle with poor oil supply is generally composed of the fuel tank, the fuel tank switch and the oil pipe. Due to the lack of maintenance for long-term use or the gasoline is too dirty, the fuel tank switch will be blocked half-blocked; or the fuel tank cover vent hole is blocked; It will cause siphoning in the fuel tank, and the oil supply will be poor at high speed. For the scooter, it is necessary to carefully check whether the vacuum tube leaks, otherwise it will affect the oil output of the automatic fuel tank switch, which also leads to poor high-speed oil supply.
b) Poor carburetor work Poor carburetor malfunction is one of the most important reasons for engine acceleration and easy flameout. One is caused by the rich combustible mixture provided by the carburetor when the throttle is opened.
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