What is the solution to the unstable idle speed of the engine?

When the engine idle speed is unstable, adjust the idle speed first. If the fault still exists after idle speed adjustment, check whether the idle speed measuring hole and the idle speed air measuring hole are blocked. If the measuring hole is blocked, clean it with gasoline or acetone and blow it clean with compressed air. If necessary, it should be overhauled and adjusted.

The working engine should be able to run evenly in the speed range of 300-500 rpm. If the minimum stable speed of the engine exceeds this speed range, or the engine is turned off and the speed is unstable within this speed range, it means that there is no idle speed or poor idle speed. If the engine runs well from low speed to high speed after starting, but turns off as soon as the accelerator pedal is released, or turns off when it is unstable, it belongs to idle stall fault. If the engine is not running smoothly at idle speed, the exhaust pipe makes a "chug chug" sound, which is generally a fault of unstable idle speed. If the minimum stable speed of the engine is higher than the specified range and the speed cannot be reduced, it means that the idle speed is too high or there is no idle speed fault.

Idle speed adjustment must be carried out under normal conditions such as normal engine temperature, proper valve clearance, normal ignition system, good pipeline sealing, full throttle opening and tight throttle closing. When adjusting, first loosen the throttle opening adjustment screw to make the engine reach the lowest stable speed. Then screw in the idle speed adjusting screw with a screwdriver, and then slowly screw out the idle speed adjusting screw when the engine is about to turn off, so that the engine runs smoothly and reaches high speed. Then loosen the throttle opening adjustment screw to minimize the engine speed. Then adjust the idle adjustment screw to increase the engine speed. Repeat this process until the throttle opening is minimum and the engine runs at the lowest stable speed.

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