Yamaha YZ85 2021 - Adjusting the Carburetor; Adjusting the Engine Idling Speed; Adjusting the Throttle Grip Free Play

Periodic maintenance and adjustment
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EAU42111
Adjusting the carburetor
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 carburetor has been set and ex-
tensively tested at the Yamaha fac-
tory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
EAU44391
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
in direction (a). To decrease the
engine idling speed, turn the throt-
tle stop screw in direction (b).
EAU48434
Adjusting the throttle grip free
play
Measure the throttle grip free play as
shown.
Periodically check the throttle grip free
play and, if necessary, adjust it as fol-
lows.
TIP
The engine idling speed must be cor-
rectly adjusted before checking and
adjusting the throttle grip free play.
1. Slide the rubber cover back.
2. Loosen the locknut.
1. Throttle stop screw
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1
(a)
(a)
(b)
(b)
(a)
(b)
1. Throttle grip free play
Throttle grip free play:
3.0–6.0 mm (0.12–0.24 in)
1
1
UB4B13E0.book Page 13 Wednesday, August 25, 2021 7:15 AM