if the filter is clean then adjust the "H" setting on the carb - the top casing of your saw will have three small holes in it marked "H, L and blank". The H setting is high speed running. turn the setting in and out whilst revving the saw - I would guess your saw is running rich and will need this setting screwed in a half turn - make sure the filter is clean and thesaw is warm before you do this.
Steve, March 2009
