Help: Wiring newer starter

[Kenfuzed]

I am trying to figure out the wiring on this new starter. This actually came up because I was helping someone else identify their wiring harness when I realized that my starter wiring setup is missing something.

This mini High Torque starter was supplied by my engine builder but it has one less terminal than my original starter (no "R"). The instructions from Hitachi say to connect the battery cable to the B terminal (obvious) and the ignition wire (purple I assume) to the spade terminal. This leaves the remaining wires that were formerly attached to the "R" terminal on my old engine/starter.

Old starter solenoid wiring shows the "R" terminal (white/green/black wires) on the far left:


New solenoid pictured below. It only has the B terminal and S terminal.