Perio
d
ic maintenance an
d
a
d
justment
7-14
7
case. The en
g
ine shoul
d
never
b
e operate
d
without the air filter
element installe
d
, otherwise the
piston(s) an
d
/or cylin
d
er(s) may
b
ecome excessively worn.
[ECA10482]
9. Install the air filter case cover by
installing the screws.
10. Connect the hoses to the air filter
case.
11. Push the air filter case onto the air
filter case joint, and then tighten
the clamp screw.
12. Install the bolts.
EAU21281
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.
EAU21341
A
d
justin
g
the en
g
ine i
d
lin
g
spee
d
The engine idling speed must be
checked and, if necessary, adjusted as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
The engine should be warm before
making this adjustment.
TIP
The engine is warm when it quick-
ly responds to the throttle.
A diagnostic tachometer is need-
ed to make this adjustment.
1. Attach the tachometer to the
spark plug lead.
2. Check the engine idling speed
and, if necessary, adjust it to
specification by turning the throt-
tle stop screw. To increase the en-
gine idling speed, turn the screw in
direction (a). To decrease the en-
gine idling speed, turn the screw in
direction (b).
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