The starter housing is usually visible on the top or side of the machine, and it's removable, so you can replace the cord when it's frayed or broken. In addition, most lawnmowers have a choke, which restricts air flow to the carburetor to make a fuel-rich mixture that makes starting easier. You may also see a primer, which pumps fuel directly into the carburetor. Overusing either of these starting aids isn't a good idea, however, because a flooded engine is just as unlikely to start as one without fuel. here