Adjusting The Carburetor; Adjusting The Engine Idling Speed - Yamaha BIGBEAR 250 Owner's Manual

3. Stop the engine and allow the exhaust pipe to
cool.
4. Install the purging bolt and tighten it.
EWB01920
POTENTIAL HAZARD
Improperly purging the exhaust system.
Hot exhaust system.
WHAT CAN HAPPEN
Could injure the eyes.
Could cause burns.
Could cause carbon monoxide poisoning,
possibly leading to death.
Could start a fire.
HOW TO AVOID THE HAZARD
8 When cleaning the spark arrester:
Always let the exhaust system cool prior to
touching exhaust components.
Always wear eye protection, and make sure
no one is behind the ATV.
Never run the engine in an enclosed area.
Make sure there are no combustible materi-
als in the area.
WARNING
EBU23940

Adjusting the carburetor

The carburetor should be checked and, if neces-
sary, adjusted at the intervals specified in the peri-
odic maintenance and lubrication chart. The
carburetor is an important part of the engine and
requires very sophisticated adjustment. Therefore,
most carburetor adjustments should be left to a
Yamaha dealer, who has the necessary profes-
sional knowledge and experience. The adjustment
described in the following section, however, may
be performed by the owner as part of routine main-
tenance.
ECB00480
CAUTION:
The carburetor has been set and extensively
tested at the Yamaha factory. Changing these
settings without sufficient technical knowl-
edge may result in poor performance of or
damage to the engine.
EBU24000

Adjusting the engine idling speed

The engine idling speed must be checked and, if
necessary, adjusted as follows at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
8-23