Yamaha TT-R90, Руководство по эксплуатации для владельца, Страница: 148 / 390

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INSP
ADJ
IDLE SPEED ADJUSTMENT/
VALVE CLEARANCE ADJUSTMENT
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it up.
2. Attach:
• Inductive tachometer
To spark plug lead.
3. Adjust:
• Idle speed
VALVE CLEARANCE ADJUSTMENT
NOTE:
• 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:
• Air scoop (right)
1
• Air filter case
2
2. Remove:
• Spark plug
• Tappet cover (intake side)
1
• Tappet cover (exhaust side)
2
Adjustment steps:
• Adjust the pilot screw.
Refer to “PILOT AIR SCREW ADJUST-
MENT” 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/90890-03113
Engine idling speed:
1,400 ~ 1,600 r/min
3. Remove:
• Timing plug
1
• Crankshaft end cover
2
• O-rings