Re: What is this solenoid type thing?
Primer Solenoid
the primer replaced the old choke butterflies in the carborators, pushing in the key activates it, like the old choke plates. if for some reason you battery dies, and you have to rope start it, and need to choke the motor move the red lever, 180 degrees, once started move back to regular position.
there is a rebuild kit for the leaking area. out lined in yellow.