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Idle Speed Adjustment - Yamaha YZ426FP Manuel D'atelier Du Proprietaire

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IDLE SPEED ADJUSTMENT/

VALVE CLEARANCE ADJUSTMENT
3 - 18
EC35M021
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it
up.
2. Adjust:
Idle speed
G
Adjustment steps:
Adjust the pilot screw.
G
Refer to "PILOT SCREW ADJUSTMENT"
section.
Turn the throttle stop screw 1 until the
G
engine runs at the lowest possible speed.
To increase idle speed →
Turn the throttle stop screw 1 in a.
To decrease idle speed →
Turn the throttle stop screw 1 out b.
Engine idling speed:
1,700 ~ 1,900 r/min
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:
Seat
G
Fuel tank
G
Refer to "SEAT, FUEL TANK AND SIDE
COVERS" section in the CHAPTER 4.
2. Remove:
Carburetor
G
Refer to "CARBURETOR" section in
the CHAPTER 4.
Spark plug cap
G
Engine stay (upper)
G
Cylinder head cover
G
Refer to "CAMSHAFTS" section in the
CHAPTER 4.
3. Remove:
Timing plug 1
G
Straight plug 2
G
O-ring
G
INSP
ADJ

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