Do a search on this forum on how to tune the saw and make sure the carb is adjusted right, then follow the right cold start procedure. If it has a primer bulb, pump it until you can feel fuel being squished through it, ignition on and choke FULLY closed, throttle SET TO FAST IDLE. Pull until it pops then open the choke but LEAVE THE THROTTLE SET AT FAST IDLE. A couple of pulls and it should start and run fast until you reset to normal idle. The Wild Thing has a button on the rear handle in front of the trigger lock-out lever to set fast idle. Don't know how the other saws achieve fast idle but they will all have it. If you try to start a cold saw with the throttle closed at the idle position, you are in for a LOT of pulling. If a saw doesn't have a primer bulb, expect to do more pulling to get it started then one with a primer.