100 motorcycle has a large throttle only after the carburetor thimble is removed.

If the upper cover of the carburetor is removed, the accelerator plunger needle is removed, and then the accelerator is too large after reinstallation, because the plunger is stuck in the wrong installation direction and cannot fall. Remove the plunger again and observe that there is a long slot on it, aiming at a raised stabilizing pin on the carburetor. There is a slope groove at the bottom of the plunger, and there is usually a grounding point at the slope, which is left by contact with the idle screw. When installing, the groove faces the direction of the idle screw.