Takes no more than a min. There is some grease and grit but nothing to worry about. They are one of my favorite investments and great for solo or small companies. I like to be able to take one power head on landscape jobs and be able to do just about anything. No separate equipment you have to bring and fill up or worry about it not starting. I usally bring both power heads just n case. If you go this route buy the km130 and call it a day.
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