Yamaha F50A - Checking the Engine Idle Speed; Checking the Ignition Timing

CHK
ADJ
Periodic checks and adjustments
3-15
62Y3A11
Checking the engine idle speed
1. Start the engine and warm it up for 5 min-
utes.
2. Attach the special service tool to high-
tension cord #1
1
, and then check the
engine idle speed. Adjust if out of specifi-
cation.
3. Turn the throttle stop screw
2
in direc-
tion
a
or
b
until the specified engine
idle speed is obtained.
NOTE:
• To increase the idle speed, turn the throttle
stop screw in direction
a
.
• To decrease the idle speed, turn the throttle
stop screw in direction
b
.
4. After adjusting the idle speed, rev the
engine a few times and let it idle for at
least 15 seconds to check the stability of
the engine.
Checking the ignition timing
1. Start the engine and warm it up for 5 min-
utes.
2. Attach the special service tool to high-
tension cord #1
1
, and then check the
engine idle speed.
3. Attach the special service tool to high-
tension cord #1
1
.
Inductive self-powered tachometer:
YU-08036-B
Digital tachometer: 90890-06760
Engine idle speed:
750
±
50 (950
±
50) r/min
S62Y3410
1
Inductive self-powered tachometer:
YU-08036-B
Digital tachometer: 90890-06760
Engine idle speed:
750
±
50 (950
±
50) r/min
Battery powered timing light: YM-33277-A
Timing light: 90890-03141
S62Y3430
1
S62Y3440
1
S62Y3450