Originally Posted by ucf_motorcycle
The TPS has to be adjusted with the throttle plates fully closed. You may need to adjust (unscrew) the idle screw and check the synchronization of the throttle plates first. All plates must be fully closed. You may need to undo the throttle cable too.
When all that is done, you can adjust the TPS. The actual upper limit is not that important, what is important is that the TPS has continuity all across is motion. That can be checked with the connector undone and with an ohmmeter. Then check the initial voltage reading
after all of that, the idle screw is used to adjust idle speed ( about 730 rpm for that motor) with a warm engine. If the thermo sensors are bad, the idle won't set correctly.