1. Engine working principle
01
Motorcycle engine is a machine that converts chemical energy into mechanical energy, and its conversion process is actually the process of working cycle. Simply put, it generates kinetic energy by burning the fuel in the cylinder to drive the reciprocating movement of the piston in the engine cylinder, which drives the connecting rod connected to the piston and the crank connected to the connecting rod to make circular motion around the center of the crankshaft. To generate power.
2. Engine structure (five systems, two institutions)
01
Starting system: The engine from the static state to the working state, must first use the external force to rotate the engine crankshaft, so that the piston for reciprocating movement, the combustible mixture in the cylinder combustion expansion work, push the piston downward movement to make the crankshaft rotation.
02
Ignition system: according to the working order of the cylinder, the electric spark of sufficient energy is generated between the two electrodes of the spark plug.
03
Lubrication system: Responsible for the lubrication of the engine to reduce wear.
04
Cooling system: Ensure that the engine is operating at the proper temperature.
05
Fuel supply system: According to the requirements of the engine, a certain amount and concentration of mixture is prepared into the cylinder, and the exhaust gas after combustion is discharged from the cylinder to the atmosphere.
06
Crank connecting rod mechanism: the main moving parts of the engine to achieve the working cycle and complete the energy conversion, which are composed of the body group, the piston connecting rod group and the small belt wheel or the driving wheel.
07
Valve mechanism: According to the working sequence and working process of the engine, the intake and exhaust valves are opened and closed regularly.
3. Quick troubleshooting of five major systems and two major institutions
01
Starting system: Fault performance: the engine can not start or start difficult, etc. (Victoria motorcycle starting system is divided into two states). Troubleshooting method: Check ① conventional start: ignition switch, brake switch, electric door lock switch, side stay switch, starting relay, starting motor, battery is working normally or damaged. ② Pulse ignition: composed of ignition switch, brake switch, electric door lock switch, side stay switch, starting relay, Hall magneto assembly, battery, start-stop controller is working normally or damaged. ③ The above faulty electrical parts need to be repaired or replaced.
02
Fuel supply system: Fault performance: the engine is difficult to start, unstable operation, power decline, etc. Troubleshooting method: First check whether there is oil in the tank and whether the oil circuit is smooth. Then check whether the carburetor (throttle) is clean and whether there is blockage or leakage. In addition, it is also necessary to check whether the fuel pump is working normally, and whether the fuel pressure (according to the national 4 standard, our corresponding model includes 150T-G, 150T-2G, 300T-G, 150T-3G, 250T-G EFI fuel system set value 350kPa) is appropriate.
03
Ignition system: Fault performance: the engine is difficult to start, unstable operation, power decline, etc. Troubleshooting method: First check whether the spark plug is carbon deposition, ablation or improper clearance, and clean or replace it if necessary. Then check whether the ignition coil is damaged and whether the ignition voltage is normal. In addition, it is also necessary to check whether the ignition Angle is accurate and whether the ignition color is blue.
04
Cooling system: Fault performance: engine overheating, water temperature is too high, coolant leakage, thermostat size cycle function does not work. Troubleshooting method: First, check whether the radiator is clean and the fan is working properly. Then check whether the coolant is sufficient and whether it needs to be replaced. Check whether the water temperature sensor and cables are normal. If the temperature of the water pipes is inconsistent, check whether the thermostat is normal.
05
Lubrication system: Fault performance: engine noise, abnormal oil pressure, oil consumption too fast. Troubleshooting method: First check whether the oil is enough and whether the oil quality is qualified. Then check whether the oil pump is working normally and whether the oil pressure is appropriate. In addition, it is necessary to check whether the oil filter is clean and whether it needs to be replaced.
06
Crank connecting rod mechanism: Fault performance: engine noise, abnormal vibration, power decline, etc. Troubleshooting method: First check whether the piston, connecting rod, crankshaft and other parts are worn or damaged. Then check the crankcase for abnormal noises or leaks. In addition, it is also necessary to check whether the crankshaft bearing is loose or worn.
07
Valve mechanism: Fault performance: insufficient engine power, starting difficulty, abnormal valve sound, etc. Troubleshooting method: First check whether the valve, valve seat, valve guide and other components are worn or damaged. Then check if the valve clearance is suitable. Check that the valve drive mechanism (such as camshaft, rocker arm, etc.) is working properly. Check whether the air filter is clean and whether there is blockage. Then check whether there is gas leakage in the intake pipe, and whether the exhaust pipe is blocked or damaged, which is easy to cause the mixture to be too thick or too thin.
(Text from the network, infringement please contact delete)
