Throttle Valve Switch, Checking/Adjusting
Checking And Adjusting The Throttle Valve SwitchCombined switch in single housing
Check switch continuity as follows
- Connect multimeter US 1119 across terminals of unplugged switch connector 1
Multimeter must read 0 ohms only when throttle lever is at idle stop and full throttle stop
Check switch-on point of throttle switch as follows
- Open throttle valve and slowly close
- Measure switch-on point with feeler gauge between idle stop and idle adjusting screw
Must be 0.05-0.10 mm (0.002-0.004 in) before idle stop (gap a)
If measurement NOT OK
- Correct by adjusting position of switch.
- Loosen screw 2 and adjust screw 3
CAUTION: Basic throttle valve adjustment must NOT be changed.
Note: Correct adjustment is important. Following are conditions that are created by improper adjustment:
Gap a too large:
- Engine surges with lean condition.
Gap a too small:
- With cold engine, stalling at full throttle acceleration.
- With engine warm, no deceleration fuel shut-off.