8-23
8
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.
CAUTION:
ECB00480
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.
NOTE:
A diagnostic tachometer is needed to make this
adjustment.
1. Start the engine and warm it up.
NOTE:
The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screw at the carburetor. To in-
crease the engine idling speed, turn the throt-
tle stop screw in direction (a), and to decrease
it, turn the screw in direction (b).
1. Throttle stop screw
Engine idling speed:
1400–1500 r/min
U1P013E0.book Page 23 Tuesday, May 8, 2007 3:45 PM
Summary of Contents for Big Bear 250
Page 1: ...READ THIS MANUAL CAREFULLY It contains important safety information OWNER S MANUAL ...
Page 2: ...EBU17091 U1P013E0 book Page 1 Tuesday May 8 2007 3 45 PM ...
Page 16: ...2 U1P013E0 book Page 3 Tuesday May 8 2007 3 45 PM ...
Page 17: ...2 U1P013E0 book Page 4 Tuesday May 8 2007 3 45 PM ...
Page 54: ...7 EBU21131 RIDING YOUR ATV U1P013E0 book Page 1 Tuesday May 8 2007 3 45 PM ...
Page 75: ...7 U1P013E0 book Page 22 Tuesday May 8 2007 3 45 PM ...
Page 79: ...7 U1P013E0 book Page 26 Tuesday May 8 2007 3 45 PM ...
Page 81: ...7 U1P013E0 book Page 28 Tuesday May 8 2007 3 45 PM ...
Page 150: ...11 EBU26132 U1P013E0 book Page 9 Tuesday May 8 2007 3 45 PM ...
Page 153: ...U1P013E0 book Page 3 Tuesday May 8 2007 3 45 PM ...
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