Idle Speed Adjustment - Yamaha WR450F(S) Owner's Service Manual

VALVE CLEARANCE ADJUSTMENT
2
c

IDLE SPEED ADJUSTMENT/

EC35M021
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it
up.
2. Adjust:
G
Adjustment steps:
Adjust the pilot screw.
G
Refer to "PILOT SCREW ADJUSTMENT"
section.
Turn the throttle stop screw 1 until the
G
specified engine idling speed.
NOTE:
Using a digital engine tachometer for idle
speed adjustment, detect the engine idling
speed by bringing the sensing element c of
the engine tachometer close to the ignition
coil 2.
To increase idle speed →
To decrease idle speed →
Turn the throttle stop screw 1 out b.
VALVE CLEARANCE ADJUSTMENT
NOTE:
The valve clearance should be adjusted
G
when the engine is cool to the touch.
The piston must be at Top Dead Center
G
(T.D.C.) on compression stroke to check or
adjust the valve clearance.
1. Remove:
G
G
2. Remove:
G
G
G
G
3 - 19
Idle speed
Turn the throttle stop screw 1 in a.
Engine idling speed:
1,700 ~ 1,900 r/min
Seat
Fuel tank
Refer to "SEAT, FUEL TANK AND SIDE
COVERS" section in the CHAPTER 4.
Carburetor
Refer to "CARBURETOR" section in
the CHAPTER 4.
Spark plug
Engine stay (upper)
Cylinder head cover
Refer to "CAMSHAFTS" section in the
CHAPTER 4.
INSP
ADJ