Motorcycle engine old hair dripping sound
Adjust the idle work must be normal in the engine temperature, the valve clearance appropriate, the ignition system is normal, the pipeline seal is good, the choke door fully open, throttle can close tight and other normal conditions. When adjusting, first turn out the throttle opening adjustment screw, so that the engine to achieve the lowest stable speed. Then use a screwdriver into the idle adjustment screw, when the engine is about to turn off, and then slowly spin out the idle adjustment screw, the engine stable operation and reach high speed. And then the throttle opening adjustment screw out, so that the engine speed can be reduced to the lowest. And then adjust the idle adjustment screw, so that the engine speed. This is repeated until the throttle opening is minimal and the engine is operating at the lowest steady speed. And finally raise the speed and suddenly turn off the throttle, the engine does not turn off the fire is still rotating is appropriate.
Working normal engine, should be able to 300-500r / min speed range of uniform operation. If the engine at a minimum stable speed exceeds the speed range, or in this speed range of the engine appears flame, speed instability, that is no idle or idle bad. Idle bad, according to its fault characteristics will be divided into idle stall, idle instability and idling too high. If the engine starts, from low to high speed when the operation is good, but a loose pedal after the release immediately after the flame, or the first unstable operation and then turn off, then the idle flame failure. Such as the engine idling operation is not smooth, the exhaust pipe issued a "sudden, sudden" sound, then the general idle instability failure. If the engine minimum speed is higher than the specified range, and can not make this speed down, compared to idle or no idle speed failure.
Idle instability performance: idle operation, the engine shaking, uneven speed. The reasons for its production are: idling air hole plug, idle device work poor, the individual cylinder spark plug spark is too weak, the individual valve seal lax, intake manifold leak, ignition time too late or too late, improper adjustment and other idle speed. When the engine idling instability, the first should be adjusted idle, such as idle speed adjustment can not be eliminated, you should check the idle air and idle air hole is blocked, such as the amount of hole plug, available gasoline or acetone cleaning and compressed air blowing; If the hole is not blocked, the engine speed should be stable at a certain speed, check the intake manifold or carburetor, the lower part of the liner is leak, such as the phenomenon of leakage, available fastening screws or, Remove the shim method to exclude. Such as idle instability accompanied by the phenomenon of engine power down, you should further check the spark plug work, valve sealing performance and ignition time is correct, if necessary, should be overhauled, adjusted.
5, throttle position sensor failure; 6, idle stepping motor failure; 7, idle control valve failure; 8, the throttle valve, the throttle valve, the throttle valve, the throttle valve, the throttle valve, the throttle valve, the throttle valve, Opening is not normal; 9, air intake system leak.
