Start setting the idle by first finding the lean-best-idle. With the saw running at idle you start turning in the L screw a little bit at a time, if it was running rich, the idle speed should increase as you turn in the screw and the chain will probably start moving. You will reach a point where the engine will want to stall because it is too lean so then back the screw out a bit until the saw runs steady. This is the Lean-best-idle and it too lean for proper operation. With the idle speed adjust screw, NOT the L screw, adjust it until the chain is just moving slowly, now back the L screw out until the chain stops moving and this should set the idle mix rich enough for good acceleration when the throttle is snapped open. If there is hesitation you will have to back the L screw out a bit more. During all this adjusting, the saw may get loaded up with fuel so make several cuts at full throttle to clean it out and get it to operating temperature then recheck the idle as you may have to go through the above process again. If you get it right and if the saw is healthy, it should restart with 1 pull within 5 minutes of being shut off.