Yamaha YFZ50 2019 Owner's Manual page 96

TIP
A diagnostic tachometer is needed to make this
adjustment.
1. Start the engine and warm it up.
TIP
The engine is warm when it quickly responds to
the throttle.
2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screw at the carburetor. To in-
crease the engine idling speed, turn the throt-
tle stop screw in direction (a), and to decrease
8
it, turn the screw in direction (b).
1. Throttle stop screw
Engine idling speed:
1600–1800 r/min
TIP
If the specified idling speed cannot be obtained as
described above, have a Yamaha dealer make the
adjustment.
8-21
(a)
(b)
1