Idle Speed Adjustment; Valve Clearance - Yamaha YSR45FX Owner's Manual

Idle speed adjustment
A diagnostic tachometer must be used for this
procedure.
1. Start the engine and warm it up for a few
minutes at approximately 1,000 to
2,000 r/min. Occasionally rev the engine
to 4,000 to 5,000 r/min. The engine is
warm when it responds quickly to the
throttle with the choke off.
2. Remove the seats. (See pages 4-16-
4-17 for seat removal and installation
procedures.)
3. Remove the console. (See page 8-9 for
console removal and installation proce-
dures.)
4. Connect the tachometer to the spark plug
lead, and then set the idle to the specified
idling speed by adjusting the throttle stop
screw. Turn the screw in direction (_ to
increase the engine speed, and in direc-
tion @ to decrease the engine speed.
8-33
Specified idle speed:
1,450-1,550 r/min
1, Throttle stop screw
5. Reinstall the console.
6. Reinstall the seats.
Valve clearance
The correct valve clearance changes with
use, resulting in improper fuel/air supply or
engine noise. To prevent this, the valve clear-
ance must be adjusted regularly. This adjust-
ment however, should be left to a professional
Yamaha service technician.