The engine is normal, but the car does not move, and the negative pressure film is not broken? 

(A generation of strong battle carbureted old goose YAMAHA CYGNUS 5ML 125)
In fact... Many times the negative pressure of the CVK carburetor is not well established, and it is not necessarily because the negative pressure membrane has a hole. Even if the leakage pressure is small or the negative pressure cannot be synchronized with the butterfly valve, the It will affect the sensitivity of the throttle response, so it is recommended to regularly repair the negative pressure film assembly (oil needle, throttle body and negative pressure film)!
Yes, you read that right...it is overhaul (inspection or repair), the negative pressure caused by some factors is not perfect, it can be repaired!
Today, I will teach you how to repair the leakage pressure of negative pressure membrane improperly~

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