i have a 1981 honda express (nc50)and i'm trying to read the wiring diagram
I personally would have used a 20 amp GFCI circuit breaker in the panel, instead of a GFCI plug. That way all the wiring from the panel out will be protected. As it is you have unprotected wires feeding the first plug. When wiring around a pool, better safe than sorry.
It is a Silicon Controlled Rectifier Diode (SCR) or Thyristor. The key is the note that says that the gate circuit is more complex than shown, that is the empty box. Hard to tell what they are doing without complete schematics.
The circuit you have given is for the ignition. The symbol is for an SCR (silicon controlled rectifier). Triggering the SCR with the coil in the flywheel causes the SCR to discharge the capacitor through the ignition coil. Once discharged the capacitor (also called a condenser) discharges below the sustaining current of the SCR and commutates (ceases conducting) ready for the next charging pulse.
That is, as it is labeled in the diagram, a Silicon Controlled Rectifier (SCR) a solid state device with three leads, it is probably mounted on a printed circuit board (and the circuit board might be encapsulated in a plastic block where you can't see it), but if it were connected to wires, each wire would go to a seperate terminal on the device. the Blue/Yellow on the diagram probably refers to a blue wire with a yellow stripe, or possibly, either blue OR yellow, depending on some variable, supplier or model or something like that, but not two different wires in the same vehicle.
This icon looks like an SCR, a silicon-controlled rectifier.
