Yamaha MZ250, Service Manual, Page: 33 / 118

2-16
CHK
ADJ
PERIODIC MAINTENANCE
a
b
1
2
3. Adjust:
9
Engine speed
Adjustment steps:
a. Loosen the throttle stop screw
1
.
b. Move the throttle lever
2
to direction
a
or
b
unit the high engine speed is
obtained.
High engine speed:
Refer to “SPECIFICATIONS” in
the Supplementary service
manual.
Direction
a
High engine speed is decreased.
Direction
b
High engine speed is increased.
c. Tighten the throttle stop screw
1
until
it touches the throttle lever.
d. Move the throttle lever
2
to direction
a
until it stops.
e. Turn the throttle stop screw
3
(carbu-
retor) in direction
c
or
d
until the low
engine speed is obtained.
Low engine speed:
Refer to “SPECIFICATIONS” in
the Supplementary service
manual.
Direction
c
Low engine speed is decreased.
Direction
d
Low engine speed is increased.
a
2
c d
3