Perio
d
ic maintenance an
d
a
d
justment
7-12
7
EAU42111
A
d
justin
g
the car
b
uretor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most
carburetor adjustments should be left
to a Yamaha dealer, who has the nec-
essary professional knowledge and ex-
perience. The adjustment described in
the following section, however, may be
serviced by the owner as part of rou-
tine maintenance.
NOTICE
ECA10551
The car
b
uretor has
b
een set an
d
ex-
tensively teste
d
at the Yamaha fac-
tory. Chan
g
in
g
these settin
g
s
without sufficient technical knowl-
e
dg
e may result in poor perfor-
mance of or
d
ama
g
e to the en
g
ine.
EAU44391
A
d
justin
g
the en
g
ine i
d
lin
g
spee
d
The engine idling speed must be ad-
justed when necessary.
1. Start the engine and thoroughly
warm it up.
2. Turn the throttle stop screw until
the engine runs at the lowest pos-
sible speed.
3. To increase the engine idling
speed, turn the throttle stop screw
in direction (a). To decrease the
engine idling speed, turn the throt-
tle stop screw in direction (b).
1. Throttle stop screw
1
(b)
(a)
UBR814E0.book Page 12 Monday, March 7, 2022 11:16 AM
