Yamaha YZ-Serie Fahrer- Und Wartungshandbuch Seite 148

PILOT AIR SCREW ADJUSTMENT/ENGINE IDLING
SPEED ADJUSTMENT/EXHAUST PIPE INSPECTION
PILOT AIR SCREW ADJUSTMENT
1. Adjust:
Pilot air screw 1
G
Adjustment steps:
NOTE:
To optimize the fuel flow at a smaller throttle
opening, each machine's pilot air screw has
been individually set at the factory. Before
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adjusting the pilot air screw, turn it in fully and
count the number of turns. Record this num-
ber as the factory-set number of turns out.
Turn in the pilot air screw until it is lightly
G
seated.
Turn out the pilot air screw by the speci-
G
fied number of turns.
ENGINE IDLING SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it up.
2. Adjust:
Engine idling speed
G
Adjustment steps:
Turn the throttle stop screw 1 until the
G
engine runs at the lowest possible speed.
To increase idle speed → Turn the throt-
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tle stop screw 1 in a.
To decrease idle speed → Turn the throt-
tle stop screw 1 out b.
EXHAUST PIPE INSPECTION
1. Inspect:
O-ring 1
G
Damage → Replace.
NOTE:
Install the O-rings with their depressed a fac-
ing inward.
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3 - 14
INSP
ADJ
Pilot air screw:
2 turns out (example)