Poor performance caused by carburetor

• By adjusting the carburetor:

• Phenomenon

  The engine starts well when choke closed, and stalled when open the choke.

• Solution

  The fuel in carburetor is too thin, needs to be adjusted

• Phenomenon

  Engine hunting at idle speed

• Solution

  Close the choke, engine stalled, means the fuel in carburetor is too thick, needs to be adjusted

  Close the choke, speed goes up, means the fuel in carburetor is too thin, needs to be adjusted

• By changing the carburetor

  1. Any problems caused by carburetor

  2. Cannot reach the high speed (based on the insulation gasket and cam timing point assembled correctly)

  3. Bad transition performance