2-18 PERIODIC MAINTENANCE
Remove the bypass screw [A], spring [B], washer [C] and
Check the bypass screw and its hole for carbon deposits.
If any carbon accumulates, wipe the carbon off the bypass
screw and the hole, using a cotton pad penetrated with a
high-flash point solvent.
Replace the O-ring with a new one.
Check the tapered portion [E] of the bypass screw for
wear or damage.
If the bypass screw is worn or damaged, replace it.
Turn in the bypass screw until it seats fully but not tightly.
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 Output Voltage Inspection of the
Main Throttle Sensor in the Fuel System (DFI) chapter).
Special Tool - Throttle Sensor Setting Adapter:
Main Throttle Sensor Output Voltage
Connections to Sensor
Meter (+) → Y/W lead
Meter (–) → BR/BK lead
DC 1.025 ∼ 1.055 V (at idle throttle opening)
If the output voltage is out of the standard, check the in-
put voltage of the main throttle sensor (see Input Voltage
Inspection of the Main Throttle Sensor in the Fuel System
Remove the vacuum gauge hoses and install the rubber
caps on the original position.
For the California Model, install the vacuum hose.
Route the vacuum hose according to Cable, Wire, and
Hose Routing section in the Appendix chapter.
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 Idle Speed Inspection and
Cable, Wire, and Hose Routing section in the Appendix
Operation with improperly adjusted, incorrectly
routed, or damaged cables could result in an un-
safe riding condition.
Check the idle speed.
Standard: 1 300 ±50 r/min (rpm)
If the idle speed is out of the specified range, adjust it.