If the oil pump parts wear out a lot, the pressure in the lubrication system decreases and noise appears
Maintenance of the K-126GU carburetor (for engines mod. 4178)
The K-126GU carburetor is used to complete the 4178 model engines, as an option to replace the K-151V carburetor
Disconnect the wire from the negative terminal of the battery.
Remove the distributor cap.