Echo CS355T just purchased and have run 1.5 tank of fuel. After saw gets hot and sits it is very hard to start. From reading on here appears they are sent with the carb tuned very lean. Can anyone explain how to richen up the carb. Do I adjust the L or the H setting. Turn the screw clockwise or counter clockwise? Thanks Have been using a old Stihl 026 for years. I like the size of the Echo.