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17 Posts
1st off make sure oil was not over filled at all it should be low if it has that much oil in air box over filling it could be the problem . 2nd any chance you have rolled the atv or put it on its side since last checking the air filter? if not i would say your pision rings are worn will have to pull top end to inspect rings ,piston ,cylinder worn top end like rings or cylinder will cause blow by past the rings and alow compression to past by rings and go into crank case and pump oil into air box through the crank case vent line
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