... ISO, EU-2,SGS certificate 4.Strong engine backpack gasoline grass cutter 1, two stroke engine fuel (# 90 above), oil, ... gasoline in cold unit shall be. Don't cut grass don't long time use maximum throttle.3, the ... adjust the carburetor.6, air cleaner filter often should check, change regularly. Dirty filter with soap and water dry cleaning ... )26More pictures showing: 41.5cc backpack gasoline grass cutter