The two-stroke motorcycle has overspeed, so it can't go back when the idle speed is high. What should we do?

Generally, the idle speed of motorcycle engine should be below 1000 rpm, and that of mopeds should be below 1200 rpm. Reason for high idle speed: 1. The return spring of the carburetor throttle cable is weak, and the throttle cannot be completely returned. 2. The throttle is loose or the throttle wire rope is stuck in the sheath. 3. The idle metering hole is too large.

Inspection steps: First, check whether the throttle valve can be completely closed. By pulling the throttle by hand, the throttle can be further closed and the idle speed can be reduced. This indicates that the high idle speed is caused by the incomplete closing of the throttle. Then check whether the return spring of the throttle cable is too weak or loose, whether the throttle steel wire is stuck in the jacket and whether the throttle is loose. In case of the above situation, it is necessary to rule out replacing and lubricating the door wire.

If the throttle valve is normal, remove the carburetor and check whether the idle metering hole is too large. If so, it should be replaced.