Hey /DIY/, Please have mercy on me as I am more mechanically

"upside down U" = Ω = Ohms.

>>1129958
Do you know why the reading rapidly changes from 0.5 to 500 if I turn the sensor too far?

>>1129963
no solid idea, guess would be that it's turning all the way around to the highest setting.

>>1129969
do you think it's maybe my multimeter giving a more precise reading? i.e it automatically starts telling me mv instead of 0.5volts

>>1129972
Hold up, aren't you trying to measure Ohms? Or is it voltage?

Either way, it's flipping because you have an auto ranging multimeter and the value you're reading is right about the threshold. 0.5 V is 500 mV.

>>1129957
>When the valve is closed, it should be 0.5
>"unplug the sensor and adjust the closed position to 1.5k ohms"

yo, before you can fix the motorcycle you need to unfuck yourself.

take a picture of what you're talking about. I don't think you even know how to ask the right question.

>>1129957
First.. Year, Make, Model.

Going to make a wild ass assumption here.

Most likely that's a "Throttle Position Sensor".
Meaning it doesn't control the "valve", it measures how var the throttle is open and tells the computer how to adjust injection/fuel.
There will be three pins on the sensor. The center is the output. One side will be voltage and the other ground.
But ignore that. Disconnect your battery and disconnect the wire leading to the sensor.
Measure from the outer pins to the center.
One pin will be very low, that's the "closed" side. If you open the throttle it will slowly increase till it hits the max or "WOT" Wide Open Throttle position. If there is infinite resistance (open) between the outer two pins then the sensor is shot.
The transition between both of these should be smooth with NO jumps or drop-outs. It's common for these to fail right where the throttle usually resides when cruising.

Once you figure out what the closed side is, adjust it.

You do have a service manual?