I may be in the market for a new lawn mower.

But, I have notice that evey mower (except for Hondas) have this bulb that
has to press at lease 3 times before starting the engine.

Why?

And why not Hondas?

Is this an anti-pollution device?

Has lawn mower engine design change that much?

I remember when all you had to do is fill the tank with gas, make sure that
the oil was full, and pull the cord.

It reminds me of the days before fuel injection in cars.