... cutter 3.ISO, EU-2,SGS certificate 4.Strong engine 4-stroke Gasoline Brush Cutter 1, two stroke engine fuel (# 90 above), oil, ... , non-professional personnel shall not adjust the carburetor.6, air cleaner filter often should check, change regularly. Dirty filter ... remove carbon once. When clearing off of cylinder head, clear the cylinders, of cylinder head, piston, valve adherent carbon. Carbon must ...