... certificate 4.Strong engine 5.2-stroke,1-cylinder backpack brush cutter 1, two stroke engine fuel (# 90 above), oil, ... Add gasoline in cold unit shall be. Don't cut grass don't long time use maximum throttle.Three, the gasoline ... repair, want to pull out spark plug hat, don't smoke, away from the fire.10, not in indoor operation ... of aluminium pipe(mm)26More pictures showing: backpack brush cutter