The ts400 has 2 adjustment screws. First pop out the rubber gromet to see the screws. The one on the left is the mixture, the one on right is the idle Turn the idle screw in a coup[le turns, this will help the saw run a little fast Now screw the mixture screw in till it bottoms .now back it out 1 and a half turn. Press the decom and pull it thru with the , the choke on a couple times, now pull up onthe decom. Try to start it. when it starts, let it runat a fast speed moving the choke off a click or two when the motor warms up, idle the engine as muchas possible, then adjust the mixture screw in or out torun the best. Squeeze the trigger if engine faulters, it's to lean, back mixture screw out slowly, till it suits you. Reinsert the gromet.
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