Yamaha YZF-R1 1998 Service Manual page 84

ADJUSTING THE ENGINE IDLING SPEED
2. Remove:
• air filter case
• quick fasteners 1
Refer to "AIR FILTER CASE AND IGNI-
TION COIL PLATE".
3. Install:
• engine tachometer
(onto the spark plug lead of cylinder #1)
Engine tachometer
90890-03113
4. Install:
• air filter case
Refer to "AIR FILTER CASE AND IGNI-
TION COIL PLATE".
5. Measure:
• engine idling speed
Out of specification → Adjust.
Engine idling speed
1,050 ~ 1,150 r/min
6. Adjust:
• engine idling speed
a. Turn the pilot screw 1 in until it is
lightly seated.
b. Turn the pilot screw out the specified
number of turns.
Carburetor angle driver
90890-03158
Pilot screw setting
2-1/2 turns out
c. Turn the throttle stop screw 2 in
direction a or b until the specified
engine idling speed is obtained.
Direction a
Direction b
3 - 17
CHK
ADJ
Engine idling speed is
increased.
Engine idling speed is
decreased.