2009 Yamaha Motorsports Rhino 450 Auto. 4x4 Owners Manual - Page 126

2009 Yamaha Motorsports Rhino 450 Auto. 4x4 Manual

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EVU00810 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 4-11- 4-12 for seat removal and installation procedures.) 3. Remove the console. (See page 8-9 for console removal and installation procedures.) 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 a to increase the engine speed, and in direction b 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 clearance must be adjusted regularly. This adjustment however, should be left to a professional Yamaha service technician.

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8-33
EVU00810
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 4-11–
4-12 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
a
to
increase the engine speed, and in direc-
tion
b
to decrease the engine speed.
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.
Specified idle speed:
1,450–1,550 r/min