Checking The Position Of The Throttle Position Sensor - KTM 450 SX ATV 2010 Repair Manual

31/CARBURETOR

Checking the position of the throttle position sensor

21.4
–
Note the position and turn the idle adjusting screw slowly counterclockwise until
the idle speed falls.
–
Adjust to the point between these two positions with the highest idle speed.
Info
If there is a large increase in the engine speed, reduce the idle speed to a
normal level and repeat the above steps.
The extremely sporty rider will set the mixture about 1/4 of a turn back from
this ideal value (leaner, clockwise) since the engine has a higher operating
temperature in sporting use.
If the procedure described here does not lead to satisfactory results, the
cause may be a wrongly dimensioned idling jet.
If you can turn the idle adjusting screw to the end without any change of
engine speed, you have to fit a smaller idling jet.
The idle adjusting screw must not be opened more than two turns. If more
than two turns are necessary (rich mixture), use a larger idling jet.
After changing the idling jet, start from the beginning with the adjusting
steps.
–
Adjust the idle speed with the adjusting screw
Guideline
Choke function deactivated – The choke lever is pushed in to the stop.
( p. 162)
Idle speed
Info
Following extreme air temperature or altitude changes, adjust the idle speed
again.
–
Remove the fuel tank. (
–
Remove the front cover. (
–
Remove the relay.
–
Mount a cable jumper between the green and red-white cables on connector
302075-10
–
Disconnect plug-in connector
302073-10
–
Connect the special tool to both connectors.
Adapter cable (83029043000) (
–
Connect the positive cable of the multimeter to the yellow cable and the ground
wire to the black cable of the special tool. Measure the throttle position sensor volt-
age.
Variable throttle position sensor volt-
age V (throttle slide closed)
var
302074-10
.

1,500... 1,600 rpm
p. 64)
p. 69)
of the throttle position sensor.

p. 236)
0.505... 0.855 V
163
.
