An opinion will not be that you are aspiring to you by some side of the carburetor or the suction collector and that it is creating that imcomplete combustion or checks the coil of the corriente distribution or the rotor of the same a crazy oinion but checks.- Greetings Alf
Hello, sometimes that symptom is caused by a bad calibration of the spark plugs, very closed, check the calibration or test by increasing the separation of the electrodes.