Hello Bondy,
First, I never assume that a solenoid or the ignition switch is serviceable, especially on a machine that is not starting.

Yes use the Honda solenoid. Just means you may have to extend some wiring.

Watch a utube video on how to test an ignition switch, using the continuity/bell setting on your multimeter.
If you clean the back of the ignition switch you may see some letters that will help.

M - magneto
S - Solenoid
L - lights
G - Ground / Earth
B - Battery

The small red wire feeds 12v from the solenoid to the ignition switch terminal (B - Battery).
It originates from one of the main terminals on top of the solenoid, must be the battery side terminal.

NOTE: In my wiring diagram, the main battery earth does not have to run from the battery to the engine, it can be connected to a good chassis earth near the battery.

Also watch a video on how to test a solenoid, it will help you understand and make your wiring job easier.
cheers

Last edited by mark electric; 03/12/15 07:18 AM. Reason: spelling

Happy is he who penetrates the mystery of things.