![]() ![]() This allows easier starting, without requiring multiple pulls of the starter cord to suck fuel up into the carburetor. The primer is a small pump (like the pump action on a bottle of window cleaner) whose function is to suck fuel up into the carburetor from the float bowl or tank. If the engine has a primer button, press it in and release it about 5 times in total.Don't use the choke if the engine has been running in the last 10 minutes or so. If there is a separate choke, turn it on when starting a cold engine and turn it off after the engine has been running for about 5 seconds. This is often the case with portable generators. There is usually a small lever for doing this which must be slid into position. A third scenario is that the choke is completely manual and must be turned on. Once the engine starts, the throttle control is pushed back to the run setting. On other mowers, the throttle needs to be set to an initial start/choke position which turns on the choke mechanism. ![]() On some mowers, the choke is completely automatic and turns off when the engine runs for a few seconds. Engines have a device called a choke (basically a plate which acts as a blockage in the air intake) which makes the fuel vapor sucked into the engine "richer" or more concentrated, and this aids starting.
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