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INSP
ADJ
ENGINE IDLING SPEED ADJUSTMENT/
VALVE CLEARANCE INSPECTION AND ADJUSTMENT
ENGINE IDLING SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it up.
2. Attach:
• Inductive tachometer
To spark plug lead.
3. Adjust:
• Engine idling speed
Adjustment steps:
• Adjust the pilot screw.
Refer to “PILOT SCREW ADJUSTMENT”
section.
• Turn the throttle stop screw 1 until the
engine runs at the lowest possible speed.
To increase idle speed
→
Turn the throt-
tle stop screw
1
in
a
.
To decrease idle speed
→
Turn the throt-
tle stop screw
1
out
b
.
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
Engine idling speed:
1,900 ~ 2,100 r/min
VALVE CLEARANCE INSPECTION AND
ADJUSTMENT
N
OTE:
• The valve clearance should be adjusted
when the engine is cool to the touch.
• The piston must be at Top Dead Center
(T.D.C.) on compression stroke to check or
adjust the valve clearance.
1. Remove:
• Seat
• Fuel tank
Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
2. Drain:
• Coolant
Refer to “COOLANT REPLACEMENT”
section.