Adjusting The Carburetor; Adjusting The Engine Idling Speed - Yamaha YZ85 Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
CAUTION:
G
Make sure that the air filter ele-
ment is properly seated in the
air filter case.
G The engine should never be op-
erated without the air filter ele-
ment installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
9. Install the air filter case cover in the
original position as shown.
6
10. Install the seat.
ECA10480

Adjusting the carburetor

The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most car-
buretor adjustments should be left to a
Yamaha dealer, who has the neces-
sary professional knowledge and expe-
rience. The adjustment described in the
following section, however, may be ser-
viced by the owner as part of routine
maintenance.
CAUTION:
The carburetor has been set and ex-
tensively tested at the Yamaha fac-
tory. Changing
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
6-14
EAU39930
Adjusting the engine idling
speed
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
ECA10550
in direction (a). To decrease the
engine idling speed, turn the throt-
tle stop screw in direction (b).
these settings
1. Throttle stop screw
EAU44390