... 4.Strong engine 5.2-stroke,1-cylinder backpack brush cutter 1, two stroke engine fuel (# 90 above), ... oil level.2, the two stroke engine air for work, the crankcase temperature cannot exceed 90 degrees ... oil, want to use correct types, are factory product, clean, gasoline to clean, fresh.5, non- ... the machine before and after each use check working part and other parts of the bolt tightness.12, ...