Periodic Maintenance Procedures
Back out the same number of turns counted when first
turned in. This is to set the screw to its original position.
A throttle body has different "turns out" of the bypass
screw for each individual unit. On setting the bypass
screw, use the "turns out" determined during disassem-
Repeat the same procedure for other bypass screws.
Repeat the synchronization.
If the vacuums are correct, check the output voltage of
the main throttle sensor (see Main Throttle Sensor Output
Voltage Inspection in the Fuel System (DFI) chapter).
Special Tool - Throttle Sensor Setting Adapter:
Main Throttle Sensor Output Voltage
Connections to Adapter:
If the output voltage is out of the standard, check the in-
put voltage of the main throttle sensor (see Main Throttle
Sensor Input Voltage Inspection in the Fuel System (DFI)
Remove the vacuum gauge hoses and install the rubber
caps on the original position.
Idle Speed Inspection
Start the engine and warm it up thoroughly.
With the engine idling, turn the handlebar to both sides
If handlebar movement changes the idle speed, the
throttle cables may be improperly adjusted or incorrectly
routed or damaged. Be sure to correct any of these
conditions before riding (see Throttle Control System
Inspection and Cable, Wire, and Hose Routing section in
the Appendix chapter).
Operation with improperly adjusted, incorrectly
routed or damaged cables could result in an unsafe
Check the idle speed.
If the idle speed is out of the specified range, adjust it.
Digital Meter (+) → R (sensor Y/W) lead
Digital Meter (–) → W (sensor BR/BK) lead
DC 0.985 ∼ 1.015 V at idle throttle opening
1 100 ±50 r/min (rpm)
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PERIODIC MAINTENANCE 2-19