Motorcycle carburetor throttle stuck.

1. First of all, after the motorcycle is started, the carburetor air inlet injects oil outward because the valve is not tightly closed or the valve clearance is too small or there is no clearance.

2. Secondly, the reverse fuel injection of carburetor is generally not a problem of carburetor, but a problem of starting cylinder and valve train. For example, if the timing is wrong, the intake carburetor will open when the cylinder is compressed, and the fuel will be injected later. This is not a carburetor problem, but a valve train problem.

3. Finally, the impurities in the gasoline flow to the carburetor, and the triangular needle is stuck. Loose closure will lead to oil leakage. Or the triangular needle is worn out.