1999 KX250 Carb questions

[wingrider101+]

 I'm going thru my recently acquired 1999 KX250.

I see nice cross-hatching in the bore looking thru the exhaust port, It starts up easily but has a very low idle.
Previous owner has the Idle screw almost all the way In to try to increase idle rpm.. it will Almost idle.. need to blip the throttle every 30 seconds or so to keep it running..

 Tonight I began removing the carb to inspect the jet size and needle setting.
before I even have the carb boot loosened - I notice a broken (Red) wire (chassis harness side of the connector) that goes to the carb fuel solenoid.

If that Solenoid is disconnected (broken wire) is the Idle circuit effected?

Do any of you have an explanation of how the Fuel Solenoid and the Throttle position sensor function on the '99 KX250 ?

[wingrider101+]

 Anybody?

[Andrew_Leitch07]

Hey man, that solenoid will definitely affect how the bike idles. Had my solenoid pull out a few times while riding and you definitely notice it.
Throttle Position Sensor (TPS)
The TPS is mounted on the carburetor and detects the throttle opening angle.
It sends signals to the CDI (Capacitor Discharge Ignition) unit to adjust ignition timing based on throttle position.
At lower RPMs or partial throttle, the ignition timing is slightly retarded for smoother power delivery.
At higher RPMs or wide-open throttle, the CDI advances the timing to optimize combustion for more power.
Fuel Solenoid
The fuel solenoid is electronically controlled and works with the TPS.
It adjusts the fuel mixture, particularly at low throttle openings, to improve throttle response and efficiency.
It helps reduce fuel consumption and emissions by leaning out the mixture when needed.