Several of my 2 cycle engines have the primer bulbs and a choke.
I thought the primer was to fill some of the carburators with fuel and the
choke was to make a richer mixture for starting cold engines.
As some have said, because they don't need them. I think, and I admit,
I'm not really and engine person, that some designs have the gas tank so
that there is always gravity feed of fuel to the carb. Some designs use
a crude pump, powered by the engine, to push the gas into the carb.
Here you need a prime bulb (not CFL :) ) to get gas to the carb before
you take that 1st pull. Some designs use engine pressure to push the
gas. Again, the prime bulb is needed when you 1st start the thing.
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