Do the ignition boxes go bad?

[BellicoseBanshee]

Take a look at the wiring diagram (2002 and up, although I have an '01 and it is the same as the '02 and up )

 

The parking brake switch has nothing to do with the TORS. The parking brake switch wires directly to the CDI. When the parking brake is set, the CDI will not let the bike rev much past idle.

 

Try connecting just the parking brake switch and see if that solves the problem (make sure ALL the TORS plugs are disconnected, as stated above). If it idles perfectly, it is unlikely that the CDI is faulty, for the CDI (solid-state component) will usually fully function or completely fail.

 

Remember, the parking brake switch (black lever on the clutch perch) must also be closed or the CDI will not let the engine rev...

 

EDIT: If the circuit is open when the parking brake is NOT set, then unplugging the connector will not effect engine RPM because the CDI will still sense an open circuit either way. I am not sure how the switch works...

The switch has two wires, one wire (green/yellow) that goes directly to the CDI, and one wire is a ground wire. When the parking brake switch plug is connected, the circuit is grounded and the CDI controls RPM according to the switch position. When the plug is disconnected, the circuit is not grounded, and the switch does not send an open or closed signal to the CDI; the CDI is no longer a rev limiter. Someone with electrical system knowledge can correct me if I am wrong...