Q: The engine idle speed is too high, how to diagnosis and treatment?

A: The engine idle speed is too high, the performance is when you lift the throttle, the engine idle speed is still higher than the specified value.

⑴ reason

① improperly adjusted throttle lever piece.

② throttle return spring is too soft.

③ limiting, block or adjust the idle speed screw disorders.

④ excellent or idling spring preload adjustment is too large.

⑵ diagnosis and treatment

Engine idle speed is too high is one of the most easy to check the fault exclusion. Should first check whether the throttle back to minimum position, if not in place, check the throttle and throttle adjustments return situation. Adjust the throttle cable limit screws, if the throttle still can not return, and then check the throttle return spring is too soft. Shortly after the overhaul if it is to debug the fuel pump, you should consider whether the correct idle speed adjustment, idling spring preload adjustment is too large, springs have been replaced already, you should check whether the strong spring.