Hi, this is John again, now we are going to be talking about starting this weed-eater. What you have also on this particular model is a bulb that will prime the engine and get the fuel mixture into the fuel area. You press this four or five times and then you have a lever here on the side and you will notice that as far as for choking the engine and getting it set to be cranked. The next thing that you need to do is grab this knob here and pull. You have a switch here on the front and it is a stop switch. Right here is the trigger and it will control the amount of gas that goes into the weed-eater as far as speeding it up or slowing it down.