The idle speed of Honda Sidi is unstable.

Keep the engine at a certain speed and listen for air leakage. If it is difficult to find out the location of oil leakage, you can apply a little oil to the middle and lower gaskets of the carburetor. The place where the oil is sucked in is the location of oil leakage, which can be eliminated by fastening screws or adding or subtracting gaskets. Then screw in the throttle adjusting screw to increase the engine speed, then tighten the idle adjusting screw and gradually loosen it to see if the speed is stable; Then loosen the throttle adjusting screw slightly, so that the engine speed is gradually reduced and the operation is stable, that is, the fan blades rotate evenly, and the blade profile (400 r/min) can be distinguished. If the adjustment fails, check the oil level from the inspection hole on the carburetor. If the oil level is too low, please adjust it. If all inspections are in good condition, continue to check the wiper tube and intake and exhaust manifold for cracks and air leakage. Remove the carburetor and blow the idle metering hole and idle air metering hole with compressed air. If it works normally after reassembly, the metering hole is blocked.

If the idle speed does not improve after the above maintenance, the fault may be caused by the engine. Usually, the gap between the intake valve rod and the guide pipe of the engine is too large, or the engine is close to overhaul, so the cylinder head should be removed for maintenance.